Hankscraft H20 Products RevV series of rotary control valves analyze real-world operating conditions for optimal efficiency and are designed with two highly polished ceramic discs. This eliminates the traditional control valve’s use of pistons and seals and also reduces the noise level during operation. The RevV4’s flowrates, advanced programming options, interlocking capabilities and a 32-mm distributor tube make this valve an excellent choice for both residential and light commercial applications. http://www.hankscraft20.com , (608) 524-4341