This 3/4' water check valve is installed in the inlet side of the circulation pumps plumbing to prevent the back flow of water through the circulation pump once the jet pump is activated. All water check valves have arrows stamped on the outside to indicate the direction of flow which should be pointer towards the circulation pump. Troubling Shooting: The symptoms of a non-operative check valve are; • Water Leak - If water is leaking from around the check valve, it should be replaced. • Rattling - A rattling check valve indicates that water is not being allowed to flow properly past/ through the check valve. • Verify the check valve is installed with the flow in the correct direction. • Heater High-Limit Tripping - Poor water flow through the check valve could lead to heater high-limit tripping.

Statistical Techniques Statistical Mechanics.

Ensure the check valve is not block by debris and operating properly. • Surging jet pump (on spas equipped with a flow switch) ___________________________________ We ship within 2 business days (oftentimes same-day). When item closes over a weekend we will ship the next business day. We ship via USPS Priority Mail and/or FedEx Ground.

If you prefer faster shipping, please make comment in check out process, or call/email us. We will attempt to accommodate your request. Tracking provided to buyer.

FREE SHIPPING on ORDERS totaling OVER $300 (see listings for details. USA customers only). Tracking information sent to buyer on all orders. Typically we can ship SAME-DAY if order is received by 1:00 PM (MST) on normal business days. Otherwise, we ship within 2 days. If you DO NOT see an item that you NEED for your Watkins manufactured spa (HotSpring. Tiger River, Limelight, Solana, HotSpot) or Jacuzzi Hot Tub -- please EMAIL US! Workplace Wellness Programs Statistics Software. Point Of Grace A Christmas Story Rar Extractor.