LEGEND MODEL T-15 and S-15 y-strainers are constructed of heavy duty bronze. They have a 20 mesh 304 stainless steel screen in sizes 1/4"-2" and a 1/16" perforated strainer in 2 1/2" and 3". The bronze retainer cap is gasketed and tapped for a closure plug (closure plug furnished). Install strainers upstream to protect valves, regulators, and meters, etc. from rust, pipe scale and dirt. Self cleaning can be accomplished by opening the valve or plug connected to the blow off outlet.