... Zincification, chromeplate, copperized, Electroplating3>screw size: BSP, NPTgrease coupler are used to connect grease gun hose and grease nipple ... markets. 1. Grease coupler/Grease nipple coupler/Grease gun coupler2. Length available: 29mm,36mm,40mm,42mm,47mm,50mm etc3. Thickness: 1mm ... or 1.5mm or 2mm 4. Finish: white zinc,yellow zinc,chrome,black etc5. Thread of coupler ...