Abstract: A bathtub overflow assembly having an overflow elbow exterior to the bathtub's overflow port with an externally threaded cylinder extending axially from the overflow elbow in the direction of the overflow port. The assembly has an overflow elbow retaining structure in the tub comprising a retainer ring having a flange sized to circumscribe the overflow port on the interior of the tub. The retainer ring has a centrally mounted sleeve which extends axially in the direction of the elbow. The sleeve is internally threaded to cooperatively engage the threads on the overflow elbow cylinder and has a length which is sufficient to enable it to overlap the overflow cylinder. An overflow test plug which threadedly mounts to the retainer ring is also disclosed.

Abstract: A pressure relief assembly for providing thermal expansion protection to plumbing lines in a water distribution system for a home or business having a clothes washing machine wherein the water supply valve or valves and the drain connection for the washing machine are provided in a washing machine box mounted in a wall cavity, the assembly comprising a water pressure relief valve connected within the washing machine box to a washer supply line before the washer supply valve with the drain line from the pressure relief valve extending to the drain opening in the washing machine box. Optionally, the washer water supply valve is also in fluid communication with a water hammer arrestor within the washing machine box.