Check the listing for details. For Kohler Rite-Temp Tub Shower Pressure Balancing Cartridge Repair Kit GP76851. Condition: New. Listed at 19.12 USD. GP76851 Mixer Cap and Pressure Balancing Unit (Shower) Parts Cartridge Compatible with Kohler, Replacement for Rite-Temp and 1/2" Shower Valve GP500520 and GP77759 Parts After Market Replacement Product description Consists of the parts replace for the #GP500520 and #GP77759 Includes cartridge and cap for 1/2" valve Controls pressure and regulates temperature to ensure a gracious shower experience Do not rotate the Cartridge, just put it in, otherwise the O-ring will shift and cause leakage. Please note it is an aftermarket replacement. Replacement for the model#GP500520 and GP77759 for 1/2" Shower Valve, AND Controls pressure and regulates temperature to ensure a gracious shower experience. For leakage 1.O-ring is the key, must be replaced, and add lubricant, then firmly placed in the correct position. 2. Do not rotate the Cartridge, just put it in, otherwise the O-ring will shift and cause leakage. 3. Tighten the screws to fix the cap and the Cartridge, or will also cause leakage.