Effortless Size & Performance - On Autopilot
The Proven Protocol: Feel Confident in Your Size, Strength, & Performance
The Auto G.R.O. Pump does the work for you - delivering stronger blood flow, fuller size, and rock-solid performance in minutes a day… without pills, guesswork, or effort.
Trusted by over 100,000+ Men
Real results. Real stories. See why men are choosing Auto GRO.
"After my 1st week of pumping coming out of the shower... my wife said, 'it looks so defined....like if you've been working it out.' Then at the beginning of my 3rd week my wife said, 'there's a big bulge through your pants... pull it out.' As i did she couldn't keep her hands off it... squeezed it, and kept repeating... 'it looks so muscular, so healthy, so thick... keep it up!' If this happened only after a couple of weeks of pumping I can't wait to see in a couple of months."
"I've never had any issues with my guy but I'm all about improving and staying as healthy as possible in all ways! I started off with a length of 8.5 inches long and 6 inches in girth. I am now 8.7 inches long and 6.3 in girth... I love the feeling when pumping and after with all the extra blood in my penis and balls."
"I get so turned on when I see my husband after he uses the pump - I looooove to feel how hard and big he is in my hands! We use the pump all the time."
"I've tried all kinds of pumps, but this one is quiet, powerful, and portable. It shocked me how effective something so compact could be."
"The digital pressure control is a game-changer. I can use it discreetly without anyone hearing it. Truly the best pump I've owned."
"After my 1st week, my wife noticed a real difference. The hands-free operation means I can just relax and let it work. Best investment I've made."
"I already had the manual Whopper and upgrading to Auto GRO was night and day. The precision control and quiet motor make every session effortless."
"I am just starting week 7 of my pumping with the whopper and already I have gained more than half an inch of penis girth, .4 inches of head girth, and .2 inches of penis length."
Auto G.R.O. Pump Systems
Longer. Thicker. Harder.
Auto G.R.O. Starter
Auto GRO pump + erection expansion cylinder. Everything you need to get started with precision pumping.
- Auto GRO precision pump unit
- Erection expansion cylinder (choose your size)
- Digital pressure control with LCD display
- Whisper-quiet, hands-free operation
- PumpSmart app included
- 30-day money-back guarantee
Installment plans available with PayPal Credit & Sezzle
Auto G.R.O. Dual (aka "Whopper")
Dual Cylinder System
Auto GRO pump + erection expansion cylinder + secondary scrotum cylinder. Our most comprehensive system for maximum gains.
- PLUS secondary expansion cylinder for the buried shaft
- Dr. Kaplan's Dual Cylinder Enlargement Protocol
- Maximize both length and girth gains
- Stimulate the suspensory ligament
- PumpSmart app + leather strap included
Installment plans available with PayPal Credit & Sezzle
Already have cylinders?
Upgrade to the Auto GRO pump. Compatible with all Dr. Joel Kaplan cylinders.
How the Auto G.R.O Works
A quick look at setup, operation, and what makes the Auto G.R.O different.
Your Results Timeline
What to expect as you progress with consistent pumping sessions.
- Immediately harder and firmer
- Thicker and fuller erection
- Overall size increase (temporary)
- Harder morning wood
- Easier and faster to get hard
- Starting to maintain gains
- Noticeably thicker erections
- Bigger even when soft/flaccid
- Noticeable permanent gains, mostly in girth
- Permanent increase in thickness by up to 10%
- Reversal of penile atrophy
- Regaining size from aging and shrinkage
- Significant increase in length, up to 15%
- Up to 20% thicker girth reported
- Fuller and larger, even flaccid
- Drastic change in sexual confidence
- 1-3 inches in length
- Up to 25% thicker girth
- Rock-hard erections
- Confidence in and out of the bedroom
THE SCIENCE
How Auto G.R.O. Protocol Creates Real Growth
Backed by 60+ published studies, vacuum therapy works through three proven biological mechanisms that regenerate growth on a cellular level.
Neovascularization
New blood vessels form and existing ones grow larger. Your blood-carrying capacity increases permanently — more blood in means bigger, harder erections.
Oxygen-Rich Blood Flow
Each session floods the tissue with oxygen-rich blood, reversing atrophy and rejuvenating penile tissue from the inside out. Cell regeneration begins immediately.
New Tissue Growth
Gentle vacuum pressure creates controlled micro-expansion in erectile tissue. Your body repairs and rebuilds with new cells — the same principle as muscle growth.
Pumping regularly prevents and reverses penile atrophy, the shrinkage caused by aging, disuse, and medical conditions. Blood flow is the bedrock of erection quality.
Why the Dual Cylinder System?
Dr. Joel Kaplan developed a 2-Phase Enlargement Program that exercises the penis in 2 different ways, leading to bigger, harder, and longer-lasting erections.
Erection Expansion
The first cylinder targets the erectile tissue in the penis shaft. Using precise vacuum pressure, the pump draws blood-flow into the penis, expanding your erection and creating micro-tears that facilitate new cell growth.
Stimulate the Buried Shaft
About 30% of the penis is located inside the body. The second cylinder fits over the penis and scrotum to stimulate the buried shaft and tug on the suspensory ligament, elongating the penis even in a flaccid state.
The Dual Cylinder System combines both phases in a single session. This is why the Auto GRO Whopper System delivers faster and more comprehensive results than single-cylinder pumping alone.
BACKED BY SCIENCE
Physician Perspectives
The National Institutes of Health has published extensive research on vacuum erection devices and their proven benefits.
Vacuum erection devices have indeed shown promise in not only increasing subjective length... VED use can thus promote corporal expansion...
Patients with 6 month postoperative VED usage experienced an increase in penile length of 5.1 cm...
Erectile Function scores were significantly higher...
The study shows VED combination therapy significantly improved penile length... Quality of Erection Questionnaire scores were significantly higher...
FREE BONUS
Track Your Progress with PumpSmart
Included free with every Auto GRO pump. PumpSmart is your personal progress tracker — log sessions, track your measurements, and get data-driven insights into your gains over time.
How Auto G.R.O. Compares
Engineered from the ground up with technology that makes pumping effortless.
Whisper-Quiet Motor
Near-silent operation for complete privacy. Nobody will know you're using it.
Digital Pressure Control
LCD display with precise pressure readout. Set your target and Auto GRO maintains it.
Compact & Travel-Ready
Smaller than a soda can. Fits in any bag for discreet use anywhere.
Hands-Free Operation
Smart auto-regulation maintains your target pressure. Just set it and relax.
Click-to-Attach
Instantly connects to any Dr. Joel Kaplan cylinder. No hoses, no hassle.
Frequently Asked Questions
The Starter System includes the Auto GRO pump and one erection expansion cylinder. The Whopper System includes the pump plus TWO cylinders — the erection expansion cylinder AND a secondary cylinder that fits over the penis and scrotum to stimulate the buried shaft. The dual system targets both phases of Dr. Kaplan's Enlargement Protocol for more comprehensive results.
Auto GRO is our electric, digitally-controlled pump. It features whisper-quiet operation, an LCD pressure display, hands-free auto-regulation, and a compact design smaller than a soda can. The manual Whopper uses a hand pump mechanism. Both deliver excellent results, but Auto GRO offers precision control and hands-free convenience.
Small (1.75"): Best if your erect girth is under 4.5 inches.
Medium (2.00"): Most popular. Best for 4.5-5.5 inch erect girth.
Large (2.25"): Best for 5.5-6 inch erect girth.
X-Large (2.50"): Best for 6+ inch erect girth.
If you're between sizes, go with the larger option. We also offer a 30-day size exchange.
Yes! The Auto GRO pump works with ALL Dr. Joel Kaplan cylinders. Simply click it into place — no adapters needed. If you already own cylinders, you can purchase just the pump unit for $159.
Very quiet. Auto GRO uses a whisper-quiet motor that's significantly quieter than traditional pumps. You can use it discreetly without anyone nearby hearing it.
Immediate temporary results from your first session. Within 2-4 weeks, most men notice improvements. By 3-6 months, expect permanent gains. Most men report 1-3 inches in length and up to 25% thicker girth within 7-12 months.
Yes. With consistent use over 3+ months, gains become permanent through new cell growth in the erectile tissue — similar to how muscles grow from exercise.
Absolutely. Many men pump right before sex for an immediately harder, larger erection. There are no restrictions on sexual activity after pumping.
PumpSmart is our free companion app. Log sessions, track measurements, and get insights into your progress. Available for iOS and Android.
Yes, worldwide. All orders ship within 1 business day in discreet, unmarked packaging. US orders ship free.
30-day money-back guarantee. Not satisfied? Return within 30 days for a full refund minus a 10% handling fee. We also offer a 30-day size exchange.
Monday-Friday, 7:30 AM - 5 PM PST. Phone: 1-800-354-3944. Email: Support@drjoelkaplan.com. Live chat also available.
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The statements on this website have not been evaluated by the FDA. Our products are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. © 2026 Dr. Joel Kaplan, Inc.