+1 For PCL.
I have recently replaced all my fittings and moved onto PCL, not a cheap operation as I had a lot to do but I was on the older Schrader fittings and these are so expensive to replace now it's unreal.
A Schrader repair fit is nearly double what new PCL fittings are.
It was OK in the early days as most of my fittings came from Plessy via the local scrap man as they were pulling buildings down but now i have run out of spares it was time to change.
There are some PCL type interchangeable fittings on Ebay that are worth keeping clear of, they work but you need 3 hand to change a tool. You have to physically pull the sleeve back before the male part will go in and that takes two hands to pull the sleeve back and the third hand to push the male fitting in.
The genuine ones allow you to just puch the male in and the sleeve moves with it.