This check valve assembly repair kit can effectively help to repair the check valve and prevent contaminated water from entering the clean water supply system. Protect your water supply system for long-term and reliable performance. Made of high-quality brass and premium plastic with a layered technical structure for extra durability and sturdiness ensuring a long lifespan. Easy Installation: No special tools are required. Simply close the valve and open the test valve to release the residual pressure then replace the defective valve, clean, and grease before you install all the components. Then you can turn on the outlet valve, completing the repair. Part Number: 905-051 Maximum Working Pressure: 150 Psi Colour:Brass Material:copper Application: Perfectly for Model 1/2 inch & 3/4 inch Backflow PVB Repair. Replace Model 765 / 905051 / 765CBV / 765DBV. Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 x Holder 1 x Spring 1 x Retainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.