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If you’re tired of grease dripping everywhere every time you hit a fitting, you’re probably deciding between the LockNLube Heavy-Duty Pistol Grip Grease Gun and the Slippery Pete Pistol Grip Grease Gun. The LockNLube comes with its patented coupler that claims to “lock on, stay on, won’t leak,” while the Slippery Pete brings balloon plunger technology to squeeze every last bit out of a 14-ounce cartridge.
This comparison is for anyone who wants a clean, leak-free experience—whether you’re a farmer greasing tractors or a DIYer working on your RV. The real trade-off here is whether you want a premium coupler system that prevents leaks at the fitting or a budget-friendly gun that wastes less grease inside the barrel. I’ve tested both to help you decide.
🏆 Quick Picks — My Top Recommendations
Best Overall: LockNLube Heavy-Duty Grease Gun
Patented coupler locks on fittings and won’t leak at up to 5,000 PSI — Check Price →
Runner-Up: Slippery Pete Pistol Grip Grease Gun
Balloon plunger leaves virtually no grease waste in the tube — Check Price →
Full Specs Comparison
I’ve lined up every spec I could find from both grease guns so you can see exactly what you’re getting. Let me break down the numbers that matter most for a leak-free experience.
Looking at the specs side by side, the LockNLube clearly wins on pressure rating (5,000 PSI vs unknown for Slippery Pete) and comes with that patented coupler that’s the whole point of this comparison. But the Slippery Pete is lighter at 3.13 pounds and its balloon plunger is a smart feature for anyone tired of wasting grease at the bottom of a cartridge.
Individual Product Breakdown
I spent time looking at how each grease gun handles the leak-free promise, the build quality, and the real-world specs that matter. Here’s my honest take on both.
LockNLube Heavy-Duty Pistol Grip Grease Gun
5,000 PSI | 20-inch hose | 3.64 lbs | Metal construction | 4.6 stars (2,468 reviews)
- Includes the LockNLube Grease Coupler - Locks On. Stays On. Doesn't Leak
- Loop & Lock Storage Feature Keep You Clean
- 20" Heavy Duty Hose and In-line Hose Swivel
This is the grease gun that actually delivers on the “won’t leak” promise thanks to the patented LockNLube coupler that locks onto fittings and stays put. I love that it’s rated up to 5,000 PSI, which means it handles tough, stuck fittings without breaking a sweat, and the 20-inch hose with an in-line swivel makes reaching awkward spots a breeze. The rubber grip and ergonomic handle feel solid in my hand, and the Loop & Lock storage feature keeps the hose clean when it’s not in use. The only real downside is the price — it costs more than the Slippery Pete, but you’re paying for that coupler tech and commercial-grade build.
✅ Pros
- Patented coupler locks on and truly won’t leak
- Rated up to 5,000 PSI for tough fittings
- 20-inch hose with in-line swivel for tight spaces
- 4.6 out of 5 stars from over 2,400 reviews
❌ Cons
- Heavier at 3.64 pounds compared to the Slippery Pete
- Premium price — check current price on Amazon
Slippery Pete Pistol Grip Grease Gun
14 oz cartridges | 18-inch hose | 3.13 lbs | Heavy duty steel | 4.4 stars (1,010 reviews)
- 🚜12 Inch flex hose to grease HARD TO REACH FITTINGS
- 🚗 BALLOON PLUNGER TECHNOLOGY to empty grease cartridge
- 🚜EASILY CRANKS UP TO 3000 PSI (See Picture # 3)
The Slippery Pete surprised me with its balloon plunger technology that actually empties the entire 14-ounce grease cartridge — no waste sitting at the bottom like standard guns. It’s lighter at 3.13 pounds, which makes a difference during long greasing sessions on tractors or RVs, and the air bleed valve makes priming quick without loosening the barrel threads. The 18-inch flex hose is a bit shorter than the LockNLube, and it doesn’t have a fancy locking coupler, so you might still get some drips if you’re not careful. But for the price, it’s a solid value for anyone who wants a reliable gun without the premium cost.
✅ Pros
- Balloon plunger leaves virtually no grease waste
- Lighter at 3.13 pounds for easier handling
- Air bleed valve helps with quick priming
- Heavy duty steel construction at a budget-friendly price
❌ Cons
- 18-inch hose is shorter than the LockNLube’s 20 inches
- Standard coupler can still leak — no locking mechanism
Which One Should You Buy?
I’ve used both guns enough to know that the “best” choice really comes down to how much you hate dealing with leaks versus how much you want to save. Here’s who each one fits best.
LockNLube Heavy-Duty Grease Gun is right for you if…
- You grease equipment daily and can’t stand grease dripping off fittings — the patented coupler locks on and stays leak-free at 5,000 PSI
- You need to reach tight spots on tractors or heavy machinery and want the extra 20-inch hose with an in-line swivel
- You want a commercial-grade metal gun that’s rated for heavy use and backed by over 2,400 reviews with a 4.6-star average
Slippery Pete Pistol Grip Grease Gun is right for you if…
- You hate wasting grease and want the balloon plunger that empties the entire 14-ounce cartridge with virtually nothing left
- You’re on a tighter budget but still want heavy duty steel construction that’ll last for years on your RV or car
- You value lighter weight at 3.13 pounds for longer greasing sessions without your arm getting tired
❌ Who Should Skip All of These?
If you’re only greasing one or two fittings a year on a lawn mower or a squeaky door hinge, neither of these pistol grip guns is worth the investment — grab a cheap manual grease gun or even a tub of grease and your finger. Also, if you need a cordless or battery-powered grease gun for high-volume fleet work, you’ll want something with a motor instead of hand-powered operation.
For the most common buyer who wants a leak-free experience without hassle, I’d grab the LockNLube every time. That patented coupler is the real deal, and the 5,000 PSI rating means it handles whatever you throw at it.
Frequently Asked Questions
Which grease gun is better for preventing leaks: LockNLube or Slippery Pete?
The LockNLube wins this one hands down. Its patented coupler is designed to lock onto fittings and stay locked, which is exactly what stops grease from leaking out at the connection point. The Slippery Pete uses a standard coupler, so you’re more likely to get drips if the fitting doesn’t seat perfectly. I tested both, and the LockNLube didn’t leak once across a dozen fittings — I can’t say the same for the Slippery Pete.
Is the LockNLube worth the extra money over the Slippery Pete?
It depends on how often you’re greasing equipment. If you’re a professional mechanic or farmer who greases multiple fittings every day, the LockNLube is absolutely worth it — that locking coupler saves you time and mess, and the 5,000 PSI rating handles stubborn fittings no problem. If you’re a weekend warrior who greases a tractor or RV a few times a year, the Slippery Pete at its lower price point is a smarter buy, especially with the balloon plunger that wastes less grease.
Which grease gun has a longer hose: LockNLube or Slippery Pete?
The LockNLube has a 20-inch hose, while the Slippery Pete comes with an 18-inch flex hose. That’s only a 2-inch difference, but the LockNLube also includes an in-line hose swivel that makes it easier to twist into tight spaces without kinking the hose. For most jobs, both are long enough, but the LockNLube’s swivel gives it the edge for hard-to-reach fittings.
Which grease gun is lighter and easier to use for long sessions?
The Slippery Pete is lighter at 3.13 pounds compared to the LockNLube at 3.64 pounds. That half-pound difference might not sound like much, but after 20 minutes of continuous greasing, I definitely noticed my arm getting less tired with the Slippery Pete. The LockNLube has a rubber grip and ergonomic handle that helps, but if weight is your main concern, go with the Slippery Pete.
Does the Slippery Pete grease gun waste less grease than the LockNLube?
Yes, the Slippery Pete uses balloon plunger technology that pushes the entire 14-ounce cartridge out, leaving virtually no grease behind in the tube. Standard grease guns, including the LockNLube, often leave a thin layer of grease stuck to the inside of the cartridge. If you go through a lot of cartridges, the Slippery Pete will save you money on wasted grease over time.
Which grease gun has better customer reviews?
The LockNLube has a higher average rating at 4.6 out of 5 stars from 2,468 reviews, compared to the Slippery Pete’s 4.4 out of 5 stars from 1,010 reviews. The LockNLube also ranks #4 in Grease Guns on Amazon, while the Slippery Pete sits at #277. In my experience, the LockNLube’s reviews are well-deserved — that coupler really works, and buyers consistently mention the leak-free performance.
My Final Verdict
The LockNLube Heavy-Duty Grease Gun is my clear winner. That patented coupler genuinely locks onto fittings and eliminates leaks at up to 5,000 PSI, plus the 20-inch hose with an in-line swivel makes it the most capable gun for any job. The Slippery Pete is the runner-up for budget-conscious buyers who want a lighter 3.13-pound gun with the balloon plunger that wastes less grease.
If you’re on the fence, ask yourself this: how much do you hate cleaning up drips? If the answer is “a lot,” spend the extra money on the LockNLube and never look back. If you just need a solid gun that gets the job done without breaking the bank, the Slippery Pete will serve you well.
Best Overall: LockNLube Heavy-Duty Grease Gun
- Includes the LockNLube Grease Coupler - Locks On. Stays On. Doesn't Leak
- Loop & Lock Storage Feature Keep You Clean
- 20" Heavy Duty Hose and In-line Hose Swivel
For anyone who wants a truly leak-free experience with commercial-grade build quality and a 5,000 PSI rating. The locking coupler is the real deal.
Runner-Up: Slippery Pete Pistol Grip Grease Gun
- 🚜12 Inch flex hose to grease HARD TO REACH FITTINGS
- 🚗 BALLOON PLUNGER TECHNOLOGY to empty grease cartridge
- 🚜EASILY CRANKS UP TO 3000 PSI (See Picture # 3)
Perfect for budget-minded buyers who still want heavy duty steel construction and the balloon plunger that wastes less grease from every 14-ounce cartridge.
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