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Feature: 1. [Perspective Mirror Design] With a transparent mirror pipe, you can observe the internal movement, the check valve itself is anti corrosion and durable, easy to install. 2. [Long Service Life] Made of durable ABS and PVC, this water hose backflow preventer is sturdy and durable, with long service life, you can use it foe r a long time. 3. [Functional Usage] Prevent unpredictable damage to the pump due to the backflow of liquid, and prevent re contamination of the filter equipment due to the backflow of liquid. 4. [Widely Used] This check valve is mainly suitable for installation in s, the water outlet pipe of the water pump in the machine room of the spa. 5. [Wide Application] Also suitable for the pipeline from the water pump of the integrated filtration equipment to the filtration equipment, the automatic drainage pipeline of the filtration equipment, etc Specification: Item Type: Check Valve Material: ABS, PVC Size: Approx. 16.5 × 11cm / 6.5 × 4.3in Weight: Approx. 439g / 15.5oz Caliber Specification: G1-1/2 (1.5inches) Use Place: , Spa. Application Scope: It Can Be Used to Install the Water Supply and Drainage Pipes of s and Spas with Acidic or Alkaline Fluids at a Temperature of 5℃~50℃. the Check Valve Relies on the Liquidflow of the Liquid Itself to Automatically Open or Close the Sealing Baffle, Thereby Forming a Directional Liquidflow State of the Liquid. It is Mainly Suitable for the Water Outlet Pipe of the Machine Room Water Pump Installed in the and Spa Pool, the Pipe from the Water Pump of the Integrated Filtering Equipment to the Filtering Equipment, the Automatic Drainage Pipe of the Filtering Equipment, Etc. The Main Function: A. Prevent Unpredictable Damage to the Pump Due to the Backflow of Liquid B. Prevent the Filter Equipment from Being Polluted Again Due to the Backflow of Liquid How to Use: Installation and use instructions: 1. Determine whether the diameter of the pipe to be installed is consistent with the installation diameter of the valve. This valve is G1‑1/2 (1.5 inch/50mm). 2. Before the valve is used, a manual operation test should be ced out to observe whether the sealing baffle of the valve will rebound to the original position to determine whether the valve is damaged during transportation. 3. Before installing the valve, check: A. Whether the water pump on the pipeline used is in the closed state. B. Whether there is debris in the valve cavity, and keep the valve cavity clean. C. The liquidflow direction marked on the valve must be consistent with the liquidflow direction of the pipeline liquid. 4. Before installation, clean the oil or other debris on the installation pipe port and inside the valve installation port. Note: When connecting the valve nozzle with the pipe nozzle, please use special PVC glue Package List: 1 x Check Valve