Burks 21124-A Bronze Diffuser 5-3/4 in ID for WA6 models except the 10WA6
The Burks 21124-A is a replacement diffuser in bronze measuring 5-3/4 in inside diameter, for all Burks WA6 models except the 10WA6. Along with the impeller it forms the working core of the pump, and the clearance between the two is what decides how much of the impeller work actually reaches the discharge.
A worn diffuser shows up as a pump that no longer makes its rated head. The passages lose their sharp entry edges, the gap at the impeller tips grows, and recirculation eats into the output. Because the impeller and diffuser wear together in the same liquid, they are normally replaced as a pair.
Material matters alongside size. Bronze is what Burks specified for this version, chosen where corrosion resistance matters more than cost, and the bore is 5-3/4 in inside diameter. Both need to match before you order.
Key Features
- Genuine Burks replacement diffuser in bronze
- 5-3/4 in inside diameter - the dimension that identifies the part
- Fits all Burks WA6 models except the 10WA6
- Restores the pressure conversion lost to worn passages
- Re-establishes the running clearance at the impeller tips
- Helps return priming performance on self-priming pumps
Applications
- Burks WA6 self-priming centrifugal pump rebuilds
- Restoring discharge head that has fallen away
- Curing slow or unreliable priming
- Repairing erosion damage from sand, scale or rust
- Replacing a diffuser alongside a new impeller
- Industrial, agricultural, marine and dockside installations
Specifications
- Brand: Burks
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: 21124-A
- Part Type: Diffuser
- Material: Bronze
- Size: 5-3/4 in inside diameter
- Fits: All Burks WA6 models except the 10WA6
- Condition: New
Frequently Asked Questions
Q: How do I measure the wear?
Check the clearance between the impeller tips and the diffuser bore at several points around the circumference, and compare it against the figure in the Burks service literature. Uneven wear also tells you whether the rotating assembly has been running true.
Q: What is the difference between the iron and bronze versions?
They are dimensionally the same part in different materials. Bronze is specified where the liquid or the environment would attack cast iron, most obviously in brackish or salt-laden service, and is the usual choice on all-bronze pump builds.
Q: Why does a worn diffuser affect priming?
A self-priming pump clears its suction line by recirculating liquid to carry air out, and that recirculation depends on the same internal clearances that make pressure. Once they open up, the pump can still move water but struggles to shift air.
Q: Can the passages be cleaned up rather than replaced?
Removing scale and deposits is worth doing and sometimes recovers useful performance. Grinding out erosion damage is not, because the passage profile is what converts velocity into pressure and reshaping it by hand does more harm than good.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct diffuser before you order.
CLRMarine
