good morning, the washers are copper ID-11/16 & OD 7/8 square cut and the thickness of a penny. they are a hair smaller than a penny & quarter they fit easily over the fitting and could even be a hair smaller but so far they are working. used my dump trailer yesterday a few times and nothing leaked on the valve so far so good. i am going to go get a digital camera today and try and get pictures.i got 2 extra washers just in case will try to post some pictures of them.
the o rings in the manifold just slide over the fitting and screw in snug. the reason they work here is because the manifold has a taper that lets the fitting and o ring seat without the oring being squished out. they will not work on the valve because it is machined flat and the orings just squish out. now you can get a different fitting that uses orings but has a retaining washer that fits over the oring to keep it from squishing out. but then u need to change to a flare type fitting because no one could find this type of fitting to match the compression type on the steel lines. hope i am not confuseing everyone, this is what i have learned in the past few days trying to fix the leak.( and i type slow)