The Amico Flowmeter swivel, FMX-SWVL-MTL, 1/8" FNPT connection type, Thorpe style, color metal, fits on any of the Amico Flowmeters. Allows to switch oxygen tubing from one source to another without removing the pipe from the hose.. Amico Standard:USA Connection Type: 1/8" FNPT Flowmeter Style: Thorpe Color: Metal