Description
Mars RD-40 Brass Body Pressure Water Reducing Valve
The Mars 10465 (Model RD-40) is a high-quality brass body pressure water reducing valve engineered to protect downstream plumbing and hydronic systems from excessive inlet pressure. Pre-set at the factory to 12 PSI and field-adjustable across a 7–25 PSI outlet range, this valve delivers reliable, consistent pressure regulation right out of the box. With a maximum inlet pressure rating of 125 PSI and a robust 3/4″ Female NPT x 3/4″ Female NPT connection, it is well-suited for a wide range of residential and light commercial HVAC and plumbing applications.
Key Features
- 3/4″ Female NPT inlet x 3/4″ Female NPT outlet connections for easy in-line installation
- 7–25 PSI outlet pressure adjustment range for flexible field configuration
- 125 PSI maximum inlet pressure rating for compatibility with standard municipal supply lines
- 12 PSI factory setpoint — ready to install with no initial adjustment required
- Durable brass body construction for long-lasting corrosion resistance
- Built-in strainer helps protect the valve seat and downstream components from debris
- Integrated check valve prevents backflow and protects system integrity
Specifications
- Model: RD-40
- SKU: 10465
- Brand: Mars
- Connection Size: 3/4″ Female NPT x 3/4″ Female NPT
- Outlet Adjustment Range: 7–25 PSI
- Maximum Inlet Pressure: 125 PSI
- Factory Setpoint: 12 PSI
- Body Material: Brass
- Built-in Strainer: Yes
- Integrated Check Valve: Yes
Applications
- Residential and light commercial hydronic heating systems
- Potable water pressure regulation
- Boiler feed and make-up water lines
- Plumbing systems requiring downstream pressure protection







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