H-200 coupler - Replaces Haywards older 200 Backwash Valves.
This fits the older Hayward-Backwash valve coupler. It is also used on some other fittings. Check that broken one, many have the number on the side of it.
WARNING: The following product(s) can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov