MAJOR UPGRADE: Tested rigorously tens of thousands of times for outstanding leak-proof performance. Enhanced design ensures no more squeaks! PERFECT FIT: RP50587 valve cartridge fits partial DST single handle kitchen and Lavatory Faucets （ DST Faucet:100/101/104/175/300/340/400/440/441/470/500/501/520/521/522/978/1353/1903/4140/4153/4353/4453/9178/997816968/16970/19888Z/19950Z） TEMPERATURE ADJUSTABLE: Features an orange tab that you can slide to adjust the maximum water temperature. NON-TOXIC MATERIALS: Made of high-quality brass and heat-resistant plastic for safe use. INCLUDES BONNET NUT: Comes with RP51503 bonnet nut and Allen wrench for easy installation. Upgrade your kitchen or bathroom faucet with this RP50587 valve cartridge compatible with Delta DST single-handle faucets. Crafted from premium brass and heat-resistant plastic, it ensures reliable performance without compromising quality. The orange temperature limiter tab allows you to easily adjust the maximum water temperature to your desired level. With a 36mm size, this cartridge offers a perfect fit, making replacement a breeze. The included RP51503 bonnet nut and Allen wrench provide all the necessary components for a seamless installation. Enhance your faucet's functionality and enjoy a refreshed water flow with this durable cartridge.