Feature●【Scope of application】：This Repair set fits for model 3/4 Inch to 1 Inch 975XL and 975XL2 reduced pressure principle backflow preventers.●【Combination suit】 1 relief valve o-ring, 2 seal rings, 1 relief valve seal ring, 1 diaphragm and 2 o-rings for the check cover.●【Advantage】：Accessories allow for speedy repairs and cost savings by avoiding full replacement.After replacement, the water leakage caused by the oxidation of the parts can be solved.●【Material】: made of materials with excellent performance and longer service life, it has strong durability, corrosion resistance and rust resistance. High quality materials make it long-term use.●【100% SATISFACTION GUARANTEE】： If youre not 100% satisfied with this tool, simply return it for a full refund in 30 days. Premium Support & 12-Month Warranty.Description If youre not 100% satisfied with this tool, simply return it for a full refund in 30 days. Premium Support & 12-Month Warranty.