I need to replace the fibre washer for the CO2-bottle-to-regulator seal - are these 'just' 3/8 fibre washers, or is there something secial about them that would prevent me from using one that fits from my screwfix selection-box of fibre washers?
I carry them in stock but there's nothing 'special' to them as far as I'm aware, only to provide a gas-tight seal on a flat seat. There is also a nylon version available. If you can find one that is a good fit I don't see any reason why you shouldn't use it.
weldequip