Check Valves. Provide an easy way to maintain prime in a suction or discharge line. Designed to fit in-line. Suitable for use with manual or electric pumps Model Specifications Product Code LV1218 LV1219 Pipe Diameter 25 mm (1") 19 mm (3?4") 28 mm (1 1/8") 25 mm (1") Materials Body: Glass-filled Polypropylene, Valve: Nitrile