Watts 3P851 77SI Y-Type Strainer

The Watts 3P851 77SI Y-Type Strainer is a 1 in cast iron inline Y-pattern strainer designed to remove dirt, rust, scale, weld slag, and other pipeline debris from water, steam, and related fluids to protect downstream equipment from damage and premature wear. It features a cast iron body and retainer cap, a stainless steel screen, and female NPT threaded connections, delivering a cleanable, serviceable design for installation in steam distribution systems, boiler plants, process piping networks, HVAC systems, pressure regulator stations, and water treatment equipment. By preventing contaminants from reaching pumps, regulators, meters, valves, heat exchangers, and instrumentation, this 77SI strainer (MPN 3P851) supports reliable operation across commercial and industrial fluid systems with service media including water, steam, air, oil, and compatible fluids.