Compatibility Guaranteed: Specifically designed for the Rainbow Automatic Chlorine/ for Bromine In-Line Pool and Spa Feeder Model 320, this R172248 check valve ensures a and seamless functionality, restoring 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 delicate 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 various pool and spa environments. Exact Fit Assurance: Meticulously designed to match the specifications of the 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 unscrew the old check valve. 3. Install the check valve. 4. Reinstall the chlorinator and replace the fixing screw, and you are done. Function: This check valve prevents water from entering the chlorinator from the return line. Color: Black Material: Metal Package Contents: 1 * R172248 Check Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.