Abstract: A plumbing valve having a plastic body with a lateral outlet and adapted for threaded connection with a metal pipe and including a resilient seal engaged and compressible upon connection of said valve body and pipe to maintain a seal therebetween incident to varying rates of expansion and contraction of said valve body and pipe with temperature changes. The valve has a rotatable actuator with an eccentric longitudinal part mounting a resilient tube having a portion pressed into contact with the cavity of the body to seal the outlet in one position and a second longitudinal part spaced from said concentric part and cooperating therewith to confine a part of said tube against radial expansion incident to liquid pressure from said metal supply pipe and retaining said tube against endwise displacement on said eccentric part.