Overview Reviews Product Description Unique patented design. Locks on.....Stays on....No leaks! Four hardened spring steel jaws are resilient under high pressure - over 10K psi. End the waste. End the mess. End greasing frustration. Fits all grease guns - 1/8" FNPT fitting. Fits all SAE & metric zerk fittings. Pressure locked? No problem, this coupler easily releases from clogged fittings, even at extreme pressures. Patented Locking Technology. US Patent 8955544 Product Videos Custom Field PSI rating 10,000=10,000 Thread 1/8"-27 FNPT Product Reviews Write a Review Write a Review × LockNLube LockNLube® 4-Jaw Premium Lock-on Grease Coupler GC81011 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *