The filter valve is usually installed at the inlet end of the main control valve to filter impurities in the water and prevent particulate impurities from entering the pipeline. Protects fittings in your system from wear and block without reducing water flow. It is highly convenient to use and maintain; remove the detachable filter mesh and reload it after cleaning. The top 1/4" lower mount thermo-manometer helps to read the hot water pressure and temperature at the inlet end of the ball valve. The 1" Male BSPT end with O ring design allows the shut-off valve to screw in your radiant manifold loops directly. No extra tools require. The ball valve and the gauge are both made of stainless steel, durable, and corrosion resistant. Premium material improves the product lifetime.