LockNLube Grease Gun Coupler XL — 3.5in Extended Reach Universal Locking, 10,000 PSI

The LockNLube Grease Gun Coupler XL is a universal, locking grease coupler with a 3.5" extended reach that grips recessed Zerk fittings for hands-free, leak-free greasing up to 10,000 PSI.

Designed for technicians, farmers, fleet mechanics, and heavy-equipment owners, this coupler solves the common problem of hard-to-access grease fittings. Its patented locking jaws create a secure seal so grease enters the fitting instead of spraying equipment, while the extra reach allows access behind shields, on PTO shafts, U-joints, and deep-set axle fittings.

How does the LockNLube XL keep grease from leaking onto my machine?

The patented locking jaws clamp firmly around the Zerk fitting to prevent pop-offs and spray-back during high-pressure greasing. That secure hold enables a true hands-free connection so grease is forced into the bearing, not onto nearby surfaces.

• Patented locking mechanism prevents coupler from popping off
• Creates a tight seal around the fitting for clean transfer
• Rated to 10,000 PSI to handle high-pressure applications

Will the extended reach really access recessed or shielded fittings?

Yes — the XL model adds 3.5 inches of reach to get to fittings that standard couplers can’t access. That extra length is ideal for grease points located behind shields, within U-joints, or on PTO splines.

• 3.5" extension reaches deep-set grease fittings
• Works on PTO shafts, U-joints, axles, and other shielded areas
• Universal fit for standard Zerk fittings found on most machinery

Can I disconnect the LockNLube XL easily after greasing?

The coupler features a one-hand thumb-release that lets you detach under pressure without fighting stuck parts or harming the grease fitting. That single-handed operation speeds routine maintenance and reduces downtime.

• Thumb-release disconnects quickly and safely
• Designed to avoid damage to Zerk fittings during removal
• Operable with one hand even when grease line is pressurized

How durable is the coupler and can I service it when parts wear?

LockNLube built the XL for demanding workshop and field use, rating it to 10,000 PSI and designing it as fully rebuildable. Internal parts can be replaced to extend service life, making it a cost-effective tool for fleets and agricultural operations.

• 10,000 PSI rating for heavy-duty maintenance tasks
• Fully rebuildable design reduces long-term replacement cost
• Rebuild kits available separately for easy maintenance

Who is this for? The LockNLube Grease Gun Coupler XL is ideal for professionals and serious DIYers who maintain tractors, trailers, construction equipment, or fleet vehicles with hard-to-reach grease points. If you need a dependable, mess-reducing coupler that stays locked under pressure, reaches recessed fittings, and can be serviced when worn, the XL is designed for your needs.