Compression outlet accommodates 1/4 in copper, polybutylene or polyethylene supply to the icemaker. 2 in extended tailpiece will accept a 1/2 in copper or a 1/2 in FIP adapter to PVC, polybutylene supplies. Molded ears nail to stud of walls from 3/16 in paneling to5/8 in drywall. Eliminates exposed piping. Saves time for installer, seals to keep out rodents and vermin. Solid, one-piece plastic box is leak, scratch, rust and shatter proof.Dimensions: Box - 6 in W x 6 in H x 3-3/8 in D, Faceplate - 8-1/4 in W x 8-1/4 in H. Valve complies with requirements of NSF 61, Section 9.