A Foster male, stainless steel, testplug - blindplug with keychain ring
This foster male blindplug can be used to protect your female quick connect coupler from dirt coming into it.
You can also use it as an endstop of your fillhose when you want to test the output of your external regulator.
You can also use it as an endstop of your fillhose when you want to test the output of your external regulator.