Anyone know the Coupling size of both sides of Clarke Ranger Compressor Shut of Valve/Tap (shown below) which, I want to replace but with a different Valve/Tap. Within the Clarke User Manual it mentions 1/4BSP; so, I understood the smaller Male thread to be 1/4 BSP and the bigger end 3/8 BSP ? The Male PCL Snap Connector, I assumed had 3/8 BSP male end ? I've bought a 3/8 BPS double Female Shut off Valve and a Male 3/8 to 1/4 reducer, which are all too big; so trying to clarify size required before I re-order. Any idea ?