This is a great valve bracket! Individually machined brass body, stainless steel pin, spring and neoprene seal. Unique retainer plug makes it possible to open the valve for cleaning. The Borac patented water system includes a stand off bracket which prevents the cage floor from becoming wet when the animals drink. The bracket snaps on 1" x 2" or smaller wire, instantly, anywhere on the cage. Requires cutting one horizontal wire in a 2" x 1" mesh, thus creating a 4" x 1" opening. For use with 5/16" tubing. The 101 valve has a barbed body for 5/16" tubing.