Ace BAC-4A Pump Body O-Ring – Centrifugal Pump Volute Seal

The Ace BAC-4A Pump Body O-Ring is a genuine Ace Pump replacement seal designed to prevent liquid from leaking between the volute and mounting frame on compatible Ace centrifugal pumps.

The O-ring creates a seal between the pump housing components, helping maintain proper operation and preventing external leaks. Over time, chemical exposure, compression, and normal wear can cause an O-ring to deteriorate, flatten, or become damaged.

The BAC-4A replaced the older BAC-4 flat fiber gasket on compatible Ace pumps beginning in 1996. The updated O-ring design provides improved sealing at operating pressures exceeding 100 PSI and allows easier removal during pump maintenance.

Whether you're replacing a mechanical seal, servicing an impeller, or repairing a leaking pump housing, the BAC-4A is an important component to inspect during pump disassembly.

Replacing a damaged O-ring can help restore a proper seal without replacing the complete pump assembly.

The Ace BAC-4A provides an OEM replacement solution for maintaining compatible agricultural spraying and liquid transfer equipment.

5. Key Features

• Genuine Ace Pump Replacement Part: OEM pump body O-ring, part number BAC-4A.

• Volute Body Seal: Helps prevent leakage between the pump volute and mounting frame.

• Updated Gasket Design: Replaced the original BAC-4 flat fiber gasket on compatible pump assemblies.

• Improved Sealing: Designed to provide effective sealing at pressures exceeding 100 PSI.

• Easier Maintenance: O-ring design does not adhere to pump castings like traditional flat gaskets.

• Multiple Pump Applications: Used in compatible Ace FMC, FMC-HYD, PTOC, and related centrifugal pump assemblies.

• Pump Repair Component: Useful when replacing mechanical seals, impellers, or servicing the pump housing.

• OEM Fitment: Designed for pump volutes manufactured with the appropriate O-ring groove.

6. Fitment / Compatible With

The Ace BAC-4A O-Ring is used in compatible Ace centrifugal pumps, including:

• Ace FMC Series – Frame-Mounted Centrifugal Pumps

• Ace FMC-HYD Series – Hydraulic-Driven Centrifugal Pumps

• Ace FMC-200-HYD Series

• Ace FMC-150 Series

• Ace PTOC Series – PTO-Driven Centrifugal Pumps

• Ace FMC-CW Series – Clockwise-Rotation Centrifugal Pumps

• Select Ace FMCL-HYD Series

Common Compatible Pump Models:

• Ace FMC-HYD-202

• Ace FMC-HYD-204

• Ace FMC-200-HYD-210

• Ace FMC-150-HYD Series

• Ace FMC-CW-150 Series

• Ace FMC-CW-200 Series

Important Compatibility Information:

• Direct replacement for Ace BAC-4A, EDP #40005.

• Replaced the older BAC-4 flat fiber gasket on applicable pumps manufactured beginning in 1996.

• The pump volute must have the proper machined groove or chamfer to accept the BAC-4A O-ring.

• Older pump volutes without the O-ring groove require the original BAC-4 gasket.

• The BAC-4 flat gasket may be used on compatible volutes with an O-ring groove.

• Not all Ace centrifugal pumps use the BAC-4A body seal.

• Verify your pump model and volute configuration before ordering.

• This listing includes one replacement O-ring, not a complete pump repair kit.