O-Ring Part Number: 13305 Alternate Part Number: AP-BP-ORING Replacement o-rings for Fleck / Rainsoft 2510, 5600, 9000, 9100 valves/couplers; and Aquasure Harmony softener bypass/meter. Package contains four (4) o-rings (also called gaskets or seals). Outside diameter is approximately 1-1/8”. Manufactured and Warrantied by Captain O-Ring LLC. Proudly assembled in the USA. The #13305 o-ring is compatible with Fleck, Rainsoft, and Aquasure water softener valves. The #13305 o-ring is most commonly used in the below applications: Fleck 2510/2510 Econominder (Control Valve, Meter, Bypass Valve) Fleck 5600/5600 Econominder (Adapter Coupling, Bypass Valve, Meter Body) Fleck 9000/9100/9500 (3/4" Meter Assembly, 1" Meter Assembly, Second Tank Assembly, Bypass Valve) Aquasure Harmony Series (Bypass/Meter) Important Note: Check your product manual’s parts diagram to ensure that you are looking for o-ring part #13305 (or AP-BP-ORING). If you are unsure of the o-ring you need, consult your product manual or contact us. Manufactured and Warrantied by Captain O-Ring LLC. Proudly assembled in the USA.