March 0125-0066-1000 O-Ring 0125-0066-1000

The March 0125-0066-1000 Buna-N O-Ring is an OEM alternate wet-end seal for compatible March Series 2 magnetic drive pumps. March identifies it as a 3/32-inch cross-section x 2-3/16-inch OD Buna-N O-ring.

This seal installs between compatible pump housing components to help contain the process liquid within the wet end. It provides a Buna-N material option for applications and pump configurations where that elastomer is appropriate.

Series 2 O-Ring Option

March parts breakdowns list 0125-0066-1000 as an alternate seal for several Series 2 pumps. For example, the 2CP-MD and AC-2AP-MD list a Viton O-ring as standard while identifying this Buna-N O-ring as an available option.

Buna-N Versus Viton

The 0125-0066-1000 Buna-N and 0125-0065-1000 Viton versions should be distinguished by material, not simply by dimensions. The appropriate elastomer depends on the pumped liquid and operating environment. A seal material suitable for one liquid may not be appropriate for another.

Maintenance and Replacement

Replace an O-ring if inspection reveals cuts, permanent compression, swelling, brittleness or other deterioration that could compromise sealing. Related wet-end surfaces should be clean and free of damage before the pump is reassembled.

Compatibility Guidance

Use the pump model, manufacturer parts breakdown and required seal material to confirm selection. Do not change from the original elastomer solely because another Series 2 O-ring has matching dimensions; verify application compatibility first.

For compatible March Series 2 pumps requiring Buna-N, 0125-0066-1000 provides the OEM replacement option for restoring the wet-end housing seal during routine maintenance or repair.