This drain pipe vent cap is designed for use in drain, waste, and vent (DWV) pipe systems, with a socket end for connecting unthreaded vent pipes. Suitable for household and industrial purposes.Specification:Color: White;Material: PVC;Size: 52 x 50mm / 2.05 x 1.97 inch (Dia*H);Inner Diameter: 50mm / 1.97 inch;Packing List: 4 x PVC Drain Pipe Vent CapAdvantage:Made of quality PVC material, high hardness, lightweight, impact resistance, and aging resistance, can be used for a long time;Fine craftsmanship, professional design, compact structure, no dirt, no water leakage; Crack resistance, pressure resistance, corrosion resistance;It has a wide range of uses and can also be used to prevent birds and other creatures from falling into chimneys, vents, and sewers, effectively avoiding pipe blockages.Instruction:Clean the outer wall of the drain pipe and the inner wall of the pipe fittings to be glued and apply glue evenly. Install the drain pipe and pipe fittings together, and use them after the glue is completely dry.NOTE:1. Please pay attention to the size before purchasing. The product does not include special glue for PVC pipes.2. It is recommended to clean the vents regularly to maintain ventilation effectiveness. Prevent the vents being blocked by dust, debris, etc., affecting ventilation effectiveness.