Flex hoses are 3/16 in (7 mm) Teflon® lined stainless steel wire braided hoses of varying lengths with 1/4 in (8 mm) 37° female JIC flare fittings. They are utilized to interconnect cylinders when a slave arrangement is required. A 1/4 in (8 mm) 37° male JIC flare x male JIC flare adapter (P/N 18777) is available to connect lengths of flex hose together.