Releasable 12mm Push Fit Connectors Pack of 4 Releasable hose connectors. Measurement is the outside Ø diameter of the pipe required. Stainless steel tube gripping claws, collars and release collet sleeves. For connecting pneumatic airlines, water & fuel hoses. Suitable hoses: PA Nylon, PU Polyurethane and PVC Poly-Vinyl Chloride. For automotive, domestic, industrial & commercial industries. For other dimensions please see picture chart. Fuel safe. Material: Steel connectors with Nylon outer casing. Other sizes and hoses available in our shop.Specification: Sizes 4 - 6mm = 16 bar @ 23°C and 10 bar @ 70° C. Sizes 10 - 15mm = 10 bar @ 23°C and 7 bar @ 70° C.