Speedfit Straight couplings. Size: Ø12mm. Pack of 5. For use with nylon tube Straight couplings supplied in sizes 6, 8,10 and 12mm. Material specifications; the bodies are produced in an acetal copolymer engineering plastic, especially suitable for pneumatics and corrosion free applications; O-rings are nitrile rubber; collets are produced in acetal copolymer with stainless steel teeth. Model No. JGCS12