Fleck (12281) O-Ring, Top of Tank; 3-1/8" ID, 3-1/2" OD, 3/16" Width Omnipure (E5386) 6"x2.5" Diameter E-Series GAC & 2 oz. Phosphate - Scale Inhibitor Standard 3/4" FPT connections install

Standard 3/4" FPT connections install with common pipe fittings and Teflon tape

or commercial applications where localized water softening is required without installing a traditional salt-based system

5" Big Blue filter housings used in whole-house systems

7 gallon total volume delivers 32-48 gallons of water at 40 PSI

Fleck (12281) O-Ring, Top of Tank; 3-1/8" ID, 3-1/2" OD, 3/16" Width Omnipure (E5386) 6"x2.5" Diameter E-Series GAC & 2 oz. Phosphate - Scale Inhibitor Standard 3/4" FPT connections installThe Fleck 12281 O Ring provides a reliable seal at the top of your water softener tank, preventing leaks where the control valve meets the mineral tank. This AS568 338 standard O ring measures 3 1 8" inner diameter, 3 1 2" outer diameter, and 3 16" width for precise fitment on Fleck valve systems. TECHNICAL DETAILS Fleck 12281 O Ring Specifications Part Number Fleck 12281 AS568 Standard Size AS568 338 Inner Diameter (ID) 3 1 8 inch Outer Diameter (OD)