Description
The Hoffman Specialty 404427 (Model B3125A-4) is a Series B3 Cast Iron Inverted Bucket Steam Trap engineered for dependable condensate discharge and air venting in commercial and industrial steam systems. With a rugged cast iron body, this trap is built to withstand the rigors of demanding steam distribution applications while delivering consistent, energy-efficient performance.
Key Features
- Series B3 inverted bucket design provides reliable, continuous steam trap operation
- Cast iron body construction for durability in high-cycle steam applications
- 1″ NPT connections for straightforward installation into standard steam piping
- 125 PSI maximum working pressure rating
- .250″ (1/4″) orifice for controlled condensate and air discharge
- Inverted bucket mechanism resists wear and provides long service life
- Suitable for steam mains, unit heaters, heat exchangers, and process equipment
How Inverted Bucket Steam Traps Work
Inverted bucket steam traps use the buoyancy of steam to keep the bucket floating and the valve closed, while condensate causes the bucket to sink and open the valve for discharge. This proven mechanical design efficiently separates condensate and non-condensable gases from live steam, protecting downstream equipment and maximizing system efficiency.
Specifications
- Brand: Hoffman Specialty (Xylem)
- SKU / Part Number: 404427
- Model: B3125A-4
- Series: B3
- Body Material: Cast Iron
- Connection Size: 1″ NPT
- Maximum Working Pressure: 125 PSI
- Orifice Size: .250″ (1/4″)
- Trap Type: Inverted Bucket
Applications
- Steam distribution mains and branch lines
- Unit heaters and cabinet heaters
- Heat exchangers and process heating equipment
- Commercial and industrial HVAC steam systems
- Drip trap applications on steam supply lines







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