Finish Thompson 106572 Buna-N Barrier O-Ring
The 106572 is the buna-n barrier o-ring used in Finish Thompson DB6, DB6H, DB7, DB8, DB9 and DB10 magnetic drive pumps. It seals the containment barrier, the cup that separates the pumped fluid from the drive magnet, against the rest of the wet end. It is built in Buna-N nitrile, which is what decides where it can safely be used.
Treat it as a service item rather than a permanent fitting. A barrier that weeps allows chemical past the one component whose whole job is to keep it away from the motor end, so any sign of dampness behind the barrier calls for a new ring before the pump goes back into service. When ordering, match the part to the pump as it was actually built rather than to the catalog model alone, since material and size options were specified at the time of purchase.
Key Features
- Buna-N Barrier O-Ring in Buna-N nitrile built to the original factory specification
- Standard barrier seal for the DB6 through DB10 wet end
- Buna-N nitrile suited to oils, fuels and general industrial duty
- Sized and finished to drop straight into the position it came from
- Inexpensive component whose failure takes the whole pump out of service
Applications
- Finish Thompson DB6, DB6H, DB7, DB8, DB9 and DB10 magnetic drive pumps
- Chemical and coolant transfer where the drive end must stay dry
- Rebuild of the barrier and drive magnet assembly
- Scheduled overhaul and annual inspection of the pump
- Repair of a pump taken out of service after a leak or a loss of performance
Specifications
- Brand: Finish Thompson
- Manufacturer Part Number: 106572
- Part Type: Buna-N Barrier O-Ring
- Material: Buna-N nitrile
- Position: Barrier to housing joint
- Fits: Finish Thompson DB6, DB6H, DB7, DB8, DB9 and DB10 magnetic drive pumps
- Quantity Per Pump: 1
- Condition: New
Frequently Asked Questions
Q: How should spare rings be stored?
Cool, dark and away from electric motors, because sunlight and ozone age rubber long before it ever reaches the pump.
Q: Is a lubricant needed on assembly?
Only one known to suit the pumped chemical, and only a trace. The wrong grease can swell the ring as badly as the wrong elastomer.
Q: Does a replacement ring need a torque check afterward?
The fasteners should be drawn down evenly in a cross pattern, then rechecked after the first run once the joint has settled.
Q: What does a flattened cross section mean?
It is compression set, and it tells you the ring has given up the elastic recovery that keeps a joint tight through heat cycles.
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 barrier O-ring before you order.
CLRMarine
