Honeywell
Honeywell DU145-3/4A Differential By-Pass Valve 3/4" BSPM
Honeywell DU145-3/4A differential by-pass valve with a 3/4" BSPM male threaded connection.
At a glance
- Also known as 4200175
£100.61
£83.84 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Honeywell DU145-3/4A is a differential by-pass valve used in heating and hot water circuits to maintain a minimum flow through the system. It opens as the differential pressure across the circuit rises, allowing water to pass through the by-pass rather than stall the pump. The valve is manufactured by Honeywell and carries a 3/4" BSPM male threaded connection.
Before you order
- Confirm the circuit requires a 3/4" BSPM male threaded connection at the valve body.
- Check the system's differential pressure setting requirements against the DU145 range before selecting this model.
- Verify the part number DU145-3/4A against the existing valve or system documentation.
Compliance
| Alternative numbers | 4200175 |
|---|
No fitment data held for this part.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.