LockNLube Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World’s best-selling original…

Amazon.com Price: $29.99 (as of 25/09/2021 16:03 PST- Details)

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Locks on, does not leak
1/8″ NPT compatible with all grease guns – battery, pneumatic, manual