Pressure Balancing Cartridge Replacement: Compatible with Price Pfister 974291 valves including 0X8, JX8, VB8, and JV8 deep casting models. Used to solve the temperature control problem: Designed to fix temperature fluctuations and hot-cold balance problems—when compatible. Use silicone grease on the two included oval O-rings to prevent leaks. Ensure the cartridge fully seats without forcing. If not seated properly, unit may only allow hot water. Includes 2 oval O rings. Make sure not roll the o ring over or it may cause leaking Be sure the old rubber gasket is not stuck inside the valve. Leaving it behind can cause gasket stacking and leaks. Use a pick tool to remove it and wipe the valve surface clean before inserting the new cartridge. Manufactured by Jadiver GM. This aftermarket 974291 pressure balancing cartridge is designed to restore proper temperature control to compatible Price Pfister shower valves. Compatible with select 0X8, JX8, VB8, and JV8 series, it is an affordable replacement for aging or malfunctioning units. When you experience only hot water flow or poor cold water return, We strongly recommend: Ensuring the valve body is clean and free from debris before installation. Applying silicone grease to the included O-rings. Verifying compatibility before purchasing the replacement parts