The SST 45mm compression & hose barb cap assembly is designed with a 1/4" id compression fitting for insertion of tube accessories and 1/4" od hose barb for silicone tubing attachment. The compression fitting is supplied with a nylon ferrule for easy adjustment of tubes. A blue polypropylene open top cap and white silicone gasket are included. 316l stainless steel compression fitting and hose barb Blue polypropylene 45mm screw cap with open top White silicone rubber gasket