hi theconnection from my oil pressure kit is leaking , im not sure wether the thread on the brass connection maybe knackered . does anyone know if you can get the union in steel and what the size and thread size is cheers j

 

Take it out, wrap the threads in a few layers of PTFE tape, available from Wickes, wrap in the same direction as you will be turning it to insert it, ie: so the wrapping will be TIGHTENED as it's screwed in, not loosened, then re-insert it and tighten.
DO NOT over tighten, once it's tight, one quarter turn at a time until it is sealed