Please consider 1808 - 3/8" FNPT P-Style Plug as a replacement.
Amflo 3/8" Automotive Style Plug with 3/8" Female End - CP6
The CP6 has a 3/8" automotive plug on one end, which would fit into and automotive styled coupler. The other end has a 3/8" female end which most commonly threads onto an air compressor port or air hose.
CP2-23
