The sprayer check valve is a spring loaded one way valve for the liquid lines of sprayers and irrigation. A stainless body with a spring holding the center disc, and a black rubber base for the seal. With the flow, the pressure lifts the disc and the liquid passes; the moment the pump stops, the disc slams home and the way back is sealed, so the medicine does not drip back into the tank. Six pipe sizes: 16 18 21, 22 26, 80 90, 120 and 150, so choose the one that matches your line. Replace it when the disc no longer seals and liquid trickles back, or when dried residue jams the mouth. Fit it with the marked direction, seat the rubber base flat, and rinse the line with clean water at the end of the day.

 FAQ 

Q1: What does the check valve do on a sprayer?

It lets liquid pass only with the pump. The moment the pump stops, the spring pushes the disc back on its seat and seals the line, so the liquid does not flow back.

Q2: How do I choose the right size?

Match it to the pipe it sits in. The range runs from 16 18 21, 22 26, 80 90, up to 120 and 150, so measure the pipe before ordering and pick the matching option.

Q3: When should I replace it?

When liquid still drips back after the pump stops, when the disc will not open and the line runs weak, or when dried residue has gummed the mouth. Rinse the line regularly to keep the valve sealing.