Rola Chem 3/8" B x 1/4" MPT In-Line Check Valve (521170) caps The Hayward seal plate is

The Hayward seal plate is designed for compatible TriStar and EcoStar C pump applications where the seal-supporting plate needs replacement

Helps restore trim and support at the skimmer opening

or less effective

the treatment side of the system can become less effective than it should

Rola Chem 3/8" B x 1/4" MPT In-Line Check Valve (521170) caps The Hayward seal plate isThe Rola Chem in line check valve is designed for compatible feeder and plumbing applications using a 3 8 inch barb by 1 4 inch male pipe thread connection format. Check valves are useful because they help maintain one way flow and reduce the chance of unwanted reverse movement within the line. This replacement is especially useful when the original valve is sticking, leaking, or no longer restricting backflow the way the system expects. Matching the