Abstract: A pipe connector comprises a body portion 10 having a male threaded tubular portion 12 defining a cavity 14 and comprises a nut 16 with a female threaded portion 18 and an unthreaded portion 20 of lesser diameter defining a bore 22. The junction between the threaded and unthreaded portions 18, 22 is constituted by an annular seat 24 against which is received a thrust washer 26 and against which in turn is received a sealing washer 28 which bears against the end of the male threaded portion 12.A radially split collar 32 has a pair of radially extending arms 34, 36 at the split and a clamping screw 38 passing through holes in the arms 36 and 34 to receive a nut 40. A radially outwardly extending annular slot 44 is formed at the mouth of the clamping means 30 and is a snap-fit over a flange 42 on the nut 16.