1 7

Crack the Code to Maximize Your Manhood

  • 4.5 out of 5 stars - 100,000+ happy customers

Get the GRO X4 and Blow Her Mind, Every Time

✅ #1 Doctor-Recommended Pump: Proven to boost erection expansion by up to 25% - guaranteed to impress.

✅ FDA-Cleared for Maximum Performance: Supercharge blood flow for rock-solid, long-lasting erections.

✅ Upgrade Your Sex Life in Minutes: See and feel immediate results and make your partner gasp, moan, and crave every inch of you.

$339.00 USD
$339.00 USD
Sale Sold out
Shipping calculated at checkout.
Variant

Easy Returns
30 Days

1 Year
Warranty

Discreet Shipping
Within 24 Hours

Secure Payment

View full details

Join 100,000+ Men Who’ve Unlocked Results with GRO X4

Achieve more thickness, more strength, more pleasure.

“Dr. Joel Kaplan is the reason why I started enlarging my penis. The pump I just bought is very effective. I am seeing & feeling better results. Thank you, Dr Joel you're a God!”


Fred, 36 years old, AZ

“I've been pumping for almost 3 months and I can't believe the results. My erections are so much thicker and harder, I sometimes don't believe it's mine! I already had to order the next size up - I can't wait to see how much bigger I'll get!”

Brian, 44 years old, FL

“I have been pumping for at least 6 months. I can honestly say this was probably the best investment I have made this year. It definitely made my penis bigger!”

Jorge, 60 years old, ID

Ready to Up Your Sex Game?

Discover the 3 Types of Men Who Thrive with GRO X4

  • The Size Kings: You’re already packing, but why not go for legendary? The GRO X4 Pump is perfect for taking your performance to the next level. Pump it up, grow more impressive, and watch as she begs for more with every thrust.
  • The Peak Performers: Remember how rock-solid you were in your 20s? Get ready to bring that back. The GRO X4 rejuvenates your erection power, making every moment feel like your prime again. Get back to your best and make her feel like she’s just met the most irresistible man alive.
  • The Relentless Lovers: For those who refuse to settle, the GRO X4 ensures every night is a victory. With extended, fuller, and more satisfying erections, you’ll have the power to fulfill her deepest desires and keep the passion alive.

If this is you, grab your private order of the GRO X4 Pump System today!

Feel more confident taking your pants off!

Even after one pumping session with GRO X4, you’ll notice a difference in how long, thick, and ready for action your penis is.

“I workout a lot, and I've never felt so confident in the locker room until now. Not only are my erections bigger, but I am so much longer - even limp! I've never felt so good taking off my pants!”

Greg, 37 years old, WA

“Dr. Kaplan's Premium Automatic pump is the best penis pump I ever tried. It makes pumping so easy and comfortable. I just choose the pressure I want and it does the pumping for me. It basically makes the process hands free - I use it while checking my email or watching TV.”

Manuel, 50 years old, CA

Choose Your GRO X4 Pump

  • BEST DEAL

    GRO X4 Pump - Manual

    Best Deal! Save BIG with this most popular bundle

    • All 4 Cylinders are included!!
    • Save BIG
    • Erections within minutes
    • Maximum Girth & Thickness
    • Pressure Gauge for Safety
    • PumpSmart™ App access
    • FDA Cleared for Erectile Dysfunction
    • Access to Dr. Joel Kaplan Coaches

    Why 4 Cylinders? When you start pumping you’ll notice that the smaller cylinder no longer gives you the space and comfort you need to thrive.

    Now Only $339.00

    Installment Plans available. Shipping calculated at checkout.

    30-Day Guarantee 30-Day Money-Back Guarantee
    Discreet Shipping 1 Year Warranty
    Discreet Shipping Discreet Shipping
    Discreet Shipping Secure Payment

  •  

    GRO X4 Pump - Automatic

    Hands-free pumping! Make your pumping journey even more pleasurable and convenient.

    • Hands-free pumping!
    • 4 Cylinders included
    • Erections within minutes
    • Maximum Girth & Thickness
    • Pressure Gauge for Safety
    • PumpSmart™ App access
    • FDA Cleared for Erectile Dysfunction
    • Access to Dr. Joel Kaplan Coaches

    Now Only $439.00

    Installment Plans available. Shipping calculated at checkout.

    30-Day Guarantee 30-Day Money-Back Guarantee
    Discreet Shipping 1 Year Warranty
    Discreet Shipping Discreet Shipping
    Discreet Shipping Secure Payment
1 2

How One Doctor is Transforming Men Everywhere – Are You Next?

100,000 Larger Men. Millions of Satisfied Nights.

Meet the man behind the size revolution – Dr. Joel Kaplan. With a PhD in sexual health and 30 years of experience, he has cracked the code on male enhancement.

His GRO X4 Pump has already transformed over 100,000 men, making them more endowed, more confident, and more potent in the bedroom.

His secret? A simple, yet highly effective method backed by science, designed to maximize your size and performance.

The question is: Are you ready to join the ranks of men who have unlocked their true potential?

The Science Behind Serious Gains

How the GRO X4 Pump Works

Dr. Kaplan bio hacked the way to a big, strong penis with the GRO X4 Pump.

Using a safe, pain-free vacuum therapy, the GRO X4 Pump boosts blood flow to expand your penile tissues, making you maximize in all the right ways.

Think of it like a workout for your manhood – every pumping session boosts your natural strength and power, helping you get a thicker, longer, and harder erection in just 2 minutes.

Or, pump a few times a week so when you penetrate her, she’ll never forget the long nights of sheet-gripping sex.

What Makes the GRO X4 Pump Different?

  • 4 Sizes Included

    Our specially designed pumps maximize expansion by offering restriction-free sizing to maximize blood-flow. The best part? The GRO X4 includes 4 sizes to accommodate erection expansion.

  • Science-Backed

    Studies from the National Institutes of Health and leading urologists have shown that Vacuum Erection Devices (VEDs) like the GRO X4 Pump significantly improve length, thickness, and erection quality.

  • Pain-Free

    No pinching, no pain, and no uncomfortable pulling with the GRO X4 Pump. Just enjoy fast and easy growth that keeps you standing tall and ready for action every time – again and again.

How to Use Your Pump for Jaw-Dropping Size & Raging Hard Erections

  • Lubricate the bottom of the cylinder and the base of the penis with Dr. Joel Kaplan's Pumper's Lube.

  • Pump up your erect penis. As you pump, you will immediately see your erection start to grow.

  • Pump the penis head with the Head Enlarger (optional).

  • For best results, secure Dr. Joel Kaplan’s Leather Strap around your penis and scrotum for 30 minutes after your pump session. This keeps the penis engorged with blood, expanding your blood vessels. This FREE-GIFT is included with your purchase!

It's Time to Touch Places You Couldn't Before

  • “I have had the GRO X4 Pump for 3 months now and already have a quarter inch added to my girth and a little over that added to my length! My penis looks so jacked now - much stronger looking than before.”

    Roberto, 55 years old, TX

  • “I’ve been pumping with the GRO X4 for a few months and I’ve already moved up a size! I’m also seeing a change in length too. I love the results and will continue to use the pump!”

    Zhang, 47 years old, CA

  • “As I have gotten older, things aren't what they used to be when I was in my 20s. But, after 16 weeks using the GRO X4 Pump – the results are impressive. You will not be disappointed!” 


    Raj, 52 years old, CA

Choose Your GRO X4 Pump

  • BEST DEAL

    GRO X4 Pump - Manual

    Save BIG with our most popular bundle including everything in the starter pump PLUS 4 cylinders. This allows you to continue to grow with ease.

    • All 4 Cylinders are included!!
    • Save BIG
    • Erections within minutes
    • Maximum Girth & Thickness
    • Pressure Gauge for Safety
    • PumpSmart™ App access
    • FDA Cleared for Erectile Dysfunction
    • Access to Dr. Joel Kaplan Coaches

    Now Only $339.00

    Installment Plans available. Shipping calculated at checkout.

    30-Day Guarantee 30-Day Money-Back Guarantee
    Discreet Shipping 1 Year Warranty
    Discreet Shipping Discreet Shipping
    Discreet Shipping Secure Payment

  •  

    GRO X4 Pump - Automatic

    Hands-free pumping! Make your pumping journey even more pleasurable and convenient.

    • Hands-free pumping!
    • 4 Cylinders included
    • Erections within minutes
    • Maximum Girth & Thickness
    • Pressure Gauge for Safety
    • PumpSmart™ App access
    • FDA Cleared for Erectile Dysfunction
    • Access to Dr. Joel Kaplan Coaches

    Now Only $439.00

    Installment Plans available. Shipping calculated at checkout.

    30-Day Guarantee 30-Day Money-Back Guarantee
    Discreet Shipping 1 Year Warranty
    Discreet Shipping Discreet Shipping
    Discreet Shipping Secure Payment
1 2

Your Growth Game Just Got Smarter

Measure Every Inch with The PumpSmart App

Success is all about seeing results – and the PumpSmart App is your tool to track every "inch" of your progress.

Log your pumping sessions, measure erection size, and watch yourself get harder and more powerful with each use.

You’ll love seeing the numbers climb, and trust us, she’ll definitely feel the difference when you go deeper than ever before.

And don’t let your progress slide – the app keeps you on top of your game, so if you notice things slowing down, it’s a sign to pump things back up.

Our most satisfied guys use it religiously, turning growth into an art form.

It’s like having a personal pump coach in your pocket – making sure you’re always primed and ready to deliver (all night if she wants).

Real Support from Real Experts to Get Real Results

Get Pro Tips & Advice from Male Performance Coaches - On-Demand

Talking about your pump journey can feel awkward – we get it.

That’s why we have KaplanCare™ Male Performance Coaches, real men who have been there, done that, and now want to help you achieve your goals.

They’re just a call or message away whenever you need guidance or motivation. Think of them as your personal team of size experts, here to make sure you reach your full potential.

Every question is welcome. Every conversation is confidential.

  • JORDAN

  • JOE

  • BEN

  • NOLAN

Call 1-800-354-3944

Monday - Friday | 7:30 AM - 5:00 PM PT

No Pressure. Just Pleasure.

Try the GRO X4 Risk-Free for 30 Days!

Still on the fence? We’ve got you covered. Try the GRO X4 Pump for 30 days and see for yourself. If you’re not thrilled with your new size, strength, and stamina, just send it back for a refund. But with these results, you’ll be too busy making her scream your name – and worn out from all the bed-quaking, sheet-soaking nights – to even think about sending it back.

Got Size Questions?

We Have Answers (And a Pump for That!)

  • Product Information
    • Why should I use a penis pump? Men use penis pumps for a variety of reasons – from enhancing their sexual performance and boosting erection quality to increasing confidence in the bedroom. Pumps can be used before intercourse to achieve a more robust, harder erection or as part of a regular exercise routine.
    • How do penis pumps work? Penis pumps use suction to draw blood into the penis, making it firmer and bigger. Pumps are popular for men dealing with issues like shrinkage, mild curvature, or for anyone looking to boost their sexual performance.
    • What’s the difference between the Automatic Pump and the Manual Hand Pump? The Automatic Pump offers a fully automated, hands-free experience, making it as easy as sitting back and enjoying the ride while it does all the work. It automatically adjusts pressure to your preferred settings, ensuring maximum safety and comfort. The Manual Hand Pump, on the other hand, gives you full control over the pumping process, allowing you to fine-tune every session to your exact preference. Whether you like convenience or a more personalized approach, both options deliver impressive results.
    • What is the difference between an AIR pump and a WATER pump? Air pumps, like the GRO X4, use vacuum pressure to draw blood into the penis, increasing its size and hardness. They come with a pressure gauge to monitor safety, making them easy and effective for all users. Water pumps, however, are only usable in the shower and lack a pressure gauge, making them less safe. Air pumps are more versatile, can be used anywhere, and provide consistent results – the clear winner for most men!
    • What does penis pumping feel like? Penis pumping is usually a pleasurable experience, creating a satisfying suctionaround the penis. Many men find it enhances their arousal and can even be used for masturbation. If you experience any discomfort, simply reduce the pressure. Remember – it’s all about finding what feels good for you!
    • Are penis pumps safe? Yes, penis pumps are safe and effective. They’ve been used for over a century to help men with erectile dysfunction and enhancement. Dr. Joel Kaplan’s penis pumps come with a safety pressure gauge to monitor vacuum pressure, ensuring a comfortable, controlled experience. However, pumps without pressure controls can be risky, so always opt for a high-quality device like ours.
    • Why is sizing important? Do you have a universal size? Sizing is critical to maximizing your results. Unlike the “one-size-fits-all” approach that some pumps use, Dr. Kaplan’s system offers specific sizing to ensure the best fit and effectiveness.
    • I’m not circumcised, can I still use a penis pump? Absolutely! The GRO X4 works effectively regardless of your circumcision status. Just follow the instructions for a comfortable and rewarding experience.
    • How often should I pump? For immediate results, use the pump whenever you want a larger, more impressive erection. Or, follow one of the exercise programs included with your Dr. Joel Kaplan pump system every other day for about 20 minutes. Your manhood will thank you!
    • When will I see results? Many men notice results immediately, such as firmer erections and increased size right after the first use.
    • I’ve outgrown my pump system. What should I do? Outgrowing your pump system is a great sign – it means you’re making excellent progress! You can purchase larger pump cylinders individually without needing a whole new system. Just pick the next size up, and keep the gains coming!
    • Does my product include a warranty? Yes! Dr. Joel Kaplan GRO X4 pump includes a 1 year warranty.

  • Packaging & Shipping Questions
    • Is the packaging discreet? Yes, we understand how important privacy is to our customers. That's why every order is shipped in plain, unmarked packaging with no logos or descriptions indicating what's inside. Even the return address is generic, so no one – not even the delivery person – will have any idea what's being delivered to your door.
    • How long will shipping take? We pride ourselves on fast, reliable shipping. Orders are processed within 1 business day, and most customers receive their packages within 3-7 business days, depending on your location. We also offer expedited shipping options if you need your order even faster. Rest assured, your package will arrive quickly, securely, and discreetly.
    • Can I track my shipment? Absolutely! Once your order has been processed and shipped, you’ll receive a confirmation email with a tracking number. You can use this number to track your package in real time, so you’ll always know where it is and when to expect delivery.
    • What if I’m not home when my package arrives? If you’re not home, no worries! Our discreet packaging has no identifying marks, so your privacy is protected. You can choose to have your package delivered to a secure location, such as a work address or a trusted neighbor. If the delivery attempt is missed, your package will typically be held at your local post office for a convenient pick-up.
    • Do you offer express shipping? Yes, for those who want their package as soon as possible, we offer express shipping options at checkout. Just select your preferred shipping speed, and your order will be prioritized for the fastest delivery available.
    • Can I have my order shipped to a different address? Absolutely! During checkout, you can enter any shipping address you prefer – whether it’s your home, office, or even a friend’s place. We’ll make sure your package arrives safely and discreetly at the address you choose.

Choose Your GRO X4 Pump

  • BEST DEAL

    GRO X4 Pump - Manual

    Save BIG with our most popular bundle including everything in the starter pump PLUS 4 cylinders. This allows you to continue to grow with ease.

    • All 4 Cylinders are included!!
    • Save BIG
    • Erections within minutes
    • Maximum Girth & Thickness
    • Pressure Gauge for Safety
    • PumpSmart™ App access
    • FDA Cleared for Erectile Dysfunction
    • Access to Dr. Joel Kaplan Coaches

    Now Only $339.00

    Installment Plans available. Shipping calculated at checkout.

    30-Day Guarantee 30-Day Money-Back Guarantee
    Discreet Shipping 1 Year Warranty
    Discreet Shipping Discreet Shipping
    Discreet Shipping Secure Payment

  •  

    GRO X4 Pump - Automatic

    Hands-free pumping! Make your pumping journey even more pleasurable and convenient.

    • Hands-free pumping!
    • 4 Cylinders included
    • Erections within minutes
    • Maximum Girth & Thickness
    • Pressure Gauge for Safety
    • PumpSmart™ App access
    • FDA Cleared for Erectile Dysfunction
    • Access to Dr. Joel Kaplan Coaches

    Now Only $439.00

    Installment Plans available. Shipping calculated at checkout.

    30-Day Guarantee 30-Day Money-Back Guarantee
    Discreet Shipping 1 Year Warranty
    Discreet Shipping Discreet Shipping
    Discreet Shipping Secure Payment
1 2