Abstract: A unitary plastic clamp for mounting copper water pipe on HYCO strap has a split cylindrical clamp portion, a rectangular mounting platform and an arm that extends from the clamp portion. The platform has a centrally located peg which is inserted into a selected hole in the strap. The platform is then twisted on the strap to engage L-shaped flanges on opposite corners of the platform with opposite side edges of the strap. The arm is then pushed up over the strap to engage a hook member on the outer end of the arm with a strap edge. The resulting spring force urges the hook member downwardly to cinch the pipe inside the clamp portion and firmly anchor the clamp and pipe relative to the strap.