LockNLube Locking Grease Gun Coupler, 1/8-Inch NPT, Rated To 10,000 PSI

Locks securely onto fittingsMany reviewers

Reviewers say it stays attached under pressure and does not pop off while greasing.

Reduces grease messMany reviewers

Reviewers say the coupler reduces leaking and wasted grease when it seals and grips the fitting properly.

Easy to releaseMany reviewers

Reviewers report that squeezing the lever releases the coupler easily, without wrestling or pulling on the hose.

Durable constructionMany reviewers

Reviewers describe the coupler as solid, heavy-duty, and well-built for regular use.

Works with difficult fittingsSome reviewers

Reviewers find it useful on loose or awkwardly positioned zerks, including some right-angle fittings.

Too bulky for tight spotsSome reviewers

Some reviewers say its length or bulk makes access difficult or impossible in recessed or confined locations.

ExpensiveA few reviewers

A reviewer considers the coupler costly, while another says its price makes its poor performance especially disappointing.

Leaks during greasingA few reviewers

Some reviewers report grease leaking around the coupler or fitting, sometimes preventing grease from entering the zerk.

Grip can fail on zerksA few reviewers

Reviewers report weak clamping or trouble sealing when fittings are blocked, dirty, or difficult to engage.