Speedfit(r) pneumatic couplings, elbow couplings supplied in sizes 6, 8,10 and 12mm. Material specifications; 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. One of a comprehensive range of high quality components for the John Guest Speedfit(r) Pneumatic Coupling System. Speedfit(r) elbow couplings. Size: 8mm. Pack of 5.