The 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) | 3-1/2 inch |
| Width (Cross Section) | 3/16 inch |
| Installation Location | Top of tank, between control valve and mineral tank opening |
| Material Type | Buna-N rubber (water-resistant elastomer) |
COMPATIBILITY & APPLICATIONS
What Systems Use This O-Ring
The Fleck 12281 O-ring is designed for use with Fleck 5600 and other Fleck control valve models that mount to standard 3-inch tank openings. This is a wear-prone seal that should be replaced whenever you remove the control valve for service, maintenance, or upgrades. Compatible with most residential and commercial water softener tanks using Fleck valve platforms. Always lubricate with silicone grease before installation to ensure proper sealing and prevent pinching during assembly.
💧 Replace this O-ring any time you remove your control valve—even if the old one looks fine, compression set reduces sealing ability over time and risks leaks during reassembly.
