Fleck (12638) O-ring Drain Fleck 5600 / O-Ring Injector Clack V3171 - AS568-016
Fleck 12638 O-Ring — Drain & Injector Seal
This is the factory-spec o-ring used in Fleck 5600 drain assemblies and Clack V3171 injector systems. Measures 11/16" OD × 9/16" ID × 1/16" cross-section, conforming to AS568-016 dimensions. Identical to Danco #35 and Danco #54 hardware store equivalents, but priced and packaged for water treatment professionals.
Dimensions & Standards
| Outside Diameter (OD) | 11/16 inch |
| Inside Diameter (ID) | 9/16 inch |
| Cross Section (CS) | 1/16 inch |
| Standard | AS568-016 |
| Material | Buna-N (Nitrile Rubber) |
| Equivalent | Danco #35, Danco #54 |
Where This O-Ring Fits
Used in Fleck 5600 and 5600SXT control valve drain line assemblies to seal against leaks during backwash and regeneration cycles. Also fits Clack V3171 injector assemblies. Common replacement part for residential and light commercial water softeners and backwashing filters. If you're rebuilding a Fleck 5600 drain assembly or servicing a Clack injector, this is the correct seal.
Standard-spec seal from a brand that's been in control valves since the 1950s.
Fleck 12638 O-Ring — Drain & Injector Seal
This is the factory-spec o-ring used in Fleck 5600 drain assemblies and Clack V3171 injector systems. Measures 11/16" OD × 9/16" ID × 1/16" cross-section, conforming to AS568-016 dimensions. Identical to Danco #35 and Danco #54 hardware store equivalents, but priced and packaged for water treatment professionals.
Dimensions & Standards
| Outside Diameter (OD) | 11/16 inch |
| Inside Diameter (ID) | 9/16 inch |
| Cross Section (CS) | 1/16 inch |
| Standard | AS568-016 |
| Material | Buna-N (Nitrile Rubber) |
| Equivalent | Danco #35, Danco #54 |
Where This O-Ring Fits
Used in Fleck 5600 and 5600SXT control valve drain line assemblies to seal against leaks during backwash and regeneration cycles. Also fits Clack V3171 injector assemblies. Common replacement part for residential and light commercial water softeners and backwashing filters. If you're rebuilding a Fleck 5600 drain assembly or servicing a Clack injector, this is the correct seal.
Standard-spec seal from a brand that's been in control valves since the 1950s.
Description
Fleck 12638 O-Ring — Drain & Injector Seal
This is the factory-spec o-ring used in Fleck 5600 drain assemblies and Clack V3171 injector systems. Measures 11/16" OD × 9/16" ID × 1/16" cross-section, conforming to AS568-016 dimensions. Identical to Danco #35 and Danco #54 hardware store equivalents, but priced and packaged for water treatment professionals.
Dimensions & Standards
| Outside Diameter (OD) | 11/16 inch |
| Inside Diameter (ID) | 9/16 inch |
| Cross Section (CS) | 1/16 inch |
| Standard | AS568-016 |
| Material | Buna-N (Nitrile Rubber) |
| Equivalent | Danco #35, Danco #54 |
Where This O-Ring Fits
Used in Fleck 5600 and 5600SXT control valve drain line assemblies to seal against leaks during backwash and regeneration cycles. Also fits Clack V3171 injector assemblies. Common replacement part for residential and light commercial water softeners and backwashing filters. If you're rebuilding a Fleck 5600 drain assembly or servicing a Clack injector, this is the correct seal.
Standard-spec seal from a brand that's been in control valves since the 1950s.
