Compatibility Guaranteed: Specifically designed for the Rainbow Automatic Chlorine/Bromine In-Line Pool and Spa Feeder Model 320, this R172248 check valve ensures seamless functionality and restores your system's efficiency without hassle. Direct Replacement: Engineered as a direct substitute for part number R172248, this check valve effectively prevents backflow of water into the chlorinator from the return line, safeguarding your pool or spa's chemical balance. Durability and Quality: Constructed from premium materials, this replacement check valve for the Rainbow 320 chlorinator offers enhanced durability and resistance to wear, ensuring long-lasting performance in pool and spa environments. Exact Fit Assurance: Meticulously designed to match the specifications of the original part, this check valve fits flawlessly into your existing setup, making installation straightforward and ensuring that your feeder operates as intended. R172248 Check Valve Replacement Product size: Inside diameter of threaded end: 1.2 cm / 0.5 inch Inside diameter of non-threaded end: 1.8 cm / 0.7 inch Length: 5.1 cm / 2 inches Easy to install: 1. Loosen the set screw under the chlorinator. 2. Unscrew the entire body of the chlorinator and remove the old check valve. 3. Install the new check valve. 4. Reinstall the chlorinator and tighten the set screw. Function: This check valve prevents water from entering the chlorinator from the return line. Color: Black Material: Metal Package Contents: 1 x R172248 Check Valve Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.