These replacement parts are made of high-quality material. They are sturdy and , not easy to break or deform, so you can use them with confidence. These repair kit are primarily intended for installation on water lines to prevent the water valve from sucking back into the water supply; this kit repair most 720A PVBs unless the ball valve or valve body itself is damaged. Our package includes 2 bonnet gaskets, 2 bonnet O-rings, 1 top cover, 1 spring, 1 base, 3 top cover screws, 1 bonnet and 1 load nut guide, a total of 12 accessories, enough to meet your installation needs. Our product is compatible with for Wilkins 1/2 inch, 3/4 inch and 1 inch pressure vacuum breakers. After replacing the 720A repair kit, it can effectively solve the leakage problem caused by oxidation of parts, and better maintain and repair a variety of drinking water pipes, garden water pipes, and industrial water pipe systems., Manufacturer: PokFhgur