LockNLube Grease Gun Coupler XL — Extra‑Reach 3.5+ in, 10,000 PSI Locking Universal Coupler

LockNLube Grease Gun Coupler XL is a universal, high-pressure locking coupler with over 3.5 inches of extra reach for secure, hands-free greasing of recessed grease fittings.

When you need to deliver grease into hard-to-reach zerks — behind shields, on PTO shafts, axles, or U-joints — the LockNLube Grease Gun Coupler XL gives you the reach, secure lock, and pressure rating to get the job done without fuss. Designed to attach to any standard grease gun with a 1/8" NPT fitting, this coupler locks onto fittings and stays attached under pressure, then releases easily with a thumb lever. Built for heavy use, it’s rated to 10,000 PSI and includes a rebuild kit so you can replace seals and jaws instead of swapping the entire coupler.

How does the LockNLube XL stay attached while I pump grease?

The coupler uses a locking jaw mechanism that clamps around SAE or metric Zerk fittings, maintaining contact as pressure climbs. The lock is engineered to resist slipping and prevent grease spray or leakage during application.

• Locking jaws secure under pressure for hands-free operation.
• Thumb lever allows safe, one-handed release after greasing.
• Rated to 10,000 PSI to handle high-pressure grease guns.

Will this coupler fit my grease gun and fittings?

Yes — the LockNLube Grease Gun Coupler XL threads into any grease gun that accepts a 1/8" NPT tip and is compatible with both SAE and metric Zerk fittings. Its universal design makes it a straightforward replacement for most standard grease gun tips.

• Standard 1/8" NPT connection fits most grease guns.
• Works with SAE and metric zerks, reducing the need for adapters.
• Simple to install and swap with existing couplers.

How does the extra reach help on recessed fittings?

With over 3.5 inches of reach, this XL coupler lets you access grease fittings hidden behind shields, housings, and other obstructions without disassembling components. That extra length reduces downtime and improves safety by minimizing awkward positioning while you grease.

• 3.5+ inch shaft reaches recessed zerks behind shields and guards.
• Ideal for PTO shafts, axles, U-joints, and confined areas.
• Saves time by avoiding partial disassembly to access fittings.

What maintenance and longevity features are included?

The coupler comes with a rebuild kit so worn seals and jaw components can be replaced quickly, extending service life and lowering long-term cost. Routine replacement of those parts keeps the locking action and sealing performance consistent over many service cycles.

• Rebuild kit contains replacement seal and jaws for easy repairs.
• Field-serviceable design avoids frequent full-unit replacement.
• Durable materials designed for shop and field environments.

Who is this for? The LockNLube Grease Gun Coupler XL is built for mechanics, farmers, fleet technicians, and DIYers who routinely service machinery with recessed grease fittings. If you use a high-pressure grease gun and need secure, hands-free contact with SAE or metric zerks — especially in confined or shielded locations — this coupler reduces mess, improves access, and keeps your grease tasks efficient. It’s also a practical choice for maintenance teams who prefer to repair rather than replace consumable parts, thanks to the included rebuild kit.