Abstract: A clamp (106) for a pipe assembly (101) having an adjustable effective length is disclosed. The clamp (106) comprises: a clamp body (107) configured to be clamped to the pipe assembly (101) and includes an engagement device (233; 234) having a channel (301); and a handle (108) pivotably connected to the clamp body (107) and includes an engagement member (227; 229). The handle 108 is pivotable between a first position in which the engagement member (227; 229) engages with the channel (301) of the engagement device (233; 234) to maintain the position of the handle relative to the clamp body whilst allowing free adjustment of the effective length of the pipe assembly, and a second position in which the engagement member is disengaged from the channel to tighten the clamp body. An engagement device (233; 234) for use in the clamp (106), and a pipe assembly (101) having an adjustable effective length and including the clamp (106) are also disclosed.