Legend Valve
Legend Valve 800-842 1/2" AF-480 Auto Fill with Gauge accessory
Auto-fill valve with integrated gauge maintains boiler pressure automatically
- Auto-fill valve maintains system pressure automatically
- Built-in gauge shows pressure at a glance
- 1/2" FNPT connection fits standard piping
- Legend Valve 800-842 model for reliable performance
- California Prop 65 listed for chemical awareness
Auto-fill valve for hydronic systems
The Legend Valve 800-842 is a 1/2 inch auto-fill assembly with an integrated gauge. It automatically maintains water pressure in closed-loop hydronic heating installations. The unit connects via FNPT threads and carries a California Proposition 65 warning for chemicals linked to cancer and reproductive harm.
Suits installers needing automatic make-up water
This accessory fits contractors who want a single component that combines fill regulation and pressure indication. It is not for installers who prefer a separate backflow preventer and pressure gauge, nor for systems that require a different connection type than FNPT.
Verify compatibility before ordering
Confirm that the existing boiler or radiator circuit uses a 1/2 inch FNPT connection for the auto-fill point. Check that the system pressure range matches the gauge scale on this model. Ensure local codes accept an integrated auto-fill device without additional backflow protection.
Highlights
- Auto-fill valve maintains system pressure automatically
- Built-in gauge shows pressure at a glance
- 1/2" FNPT connection fits standard piping
- Legend Valve 800-842 model for reliable performance
- California Prop 65 listed for chemical awareness
Specifications
| Brand | LEGEND VALVE |
|---|
Questions about this item
What size piping is required to connect the 1/2" AF-480 auto fill valve?
The valve uses a 1/2 inch female NPT connection, so you need matching 1/2 inch male NPT piping or fittings for installation.
Will the 800-842 auto fill valve operate correctly with an older boiler system?
Yes, the 1/2 inch FNPT connection is a standard interface compatible with many existing hydronic heating systems and older boiler piping.
How can I verify the Legend Valve 800-842 is maintaining pressure after installation?
Observe the integrated gauge needle; it should display a stable pressure reading that matches your system's required fill pressure setting.
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