The PROLUBE Slim Line Hydraulic Couplers are the slimmest jaw type grease coupler, perfect for spaces and fittings with a narrow access. Meant for hand-operated Grease Guns, these couplers provide a durable and leak-proof quick connection on a 1/8" NPT thread while withstanding high pressures within its hardened body. The 3 fully hardened spring steel jaws ensure that the coupler securely attaches to the grease fitting providing a leak-proof seal. The coupler nut and body can be tightened by hand to adjust to various nipple sizes. 

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