Since the PISTON is OBSOLTE ( none left for sale ),
We still can offer Seals & Spacers,
and the Main Gear common to this valve,
The two backwash only valves we offer ( Fleck 5600 and Hankscraft HD-FTC ) are listed as Related Products.
But note, these valves will only work if your valve connection is THREADED.
see more about UNIFLEX and the Clamp on Tank to Valve problem here: