The Upper Plunger for Relief Valve is a precision replacement component for the relief valve in 1 1⁄4”, 1 ½”, and 2” backflow preventers (model 975XL and 975XL2). Designed to regulate pressure within the relief valve, it ensures proper operation and helps maintain compliance with ASSE® 1013 standards. Durable and easy to install, this plunger is essential for restoring functionality to the relief valve section and maintaining reliable backflow protection.