Old Geezer
Active Member
Sorry, my bad you are right it was 10mm, I have edited the post in case someone decided to follow it.Sorry to be picky but 1/8 bsp requires a 10mm hole. Schrader valves require an 8mm hole.
I’m surprised you managed to get the gauge thread to seal just with a loose brass washer and a rubber washer. Whenever I try it I always get a leak up the thread. Well done!
I did think about pressure leaking up the thread and ordered some Dowty sealing washers but they hadn't arrived when I fitted the gauge, fortunately, I haven't needed them, at least I have them now in case I get a problem with the other two.
Have you tried Dowty washers AKA Bonded Seal Washers it may just work for you?
Pack of 5 1/8 BSP Dowty washers £1.99 on eBay probably cheaper still if you shop around.