Biba, Here's a picture of the VW valve. They came in 2 and 10 pound versions, you want the 2 pound. The nice thing if you can find them, is they screw into the master and you can screw the existing lines into them without having to cut or modify anything.
Dick Stachowiak [demime 1.01d removed an attachment of type image/jpeg which had a name of stockresidualpressurevalves.jpg] -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]

