Toilet Tank, White, 1.28 Gallons per Flush, Right Hand Lever

Gerber GWS3859097 – Fluidmaster® 400A Toilet Fill Valve, Adjustable 10"–15"

The Gerber GWS3859097 includes the Fluidmaster® 400A toilet tank fill valve, a reliable replacement solution for gravity-fed toilet systems. This adjustable fill valve regulates water flow into the tank after flushing and is engineered for compatibility with a wide range of standard toilet configurations.

Product Features

• Adjustable Valve Height – Extends from 10 to 15 inches for compatibility with most tank sizes.
• Anti-Siphon Design – Prevents backflow to safeguard potable water supply (meets ASSE standards).
• Non-Corrosive Construction – Made from engineered plastics for resistance to scale, corrosion, and chemical degradation.
• Universal Fit – Designed to retrofit most two-piece and one-piece toilet tanks using standard 7/8" ballcock connections.
• Quiet Refill – Built-in flow control reduces fill noise while maintaining optimal tank recharge speed.

Technical Specifications

• Manufacturer Part Number: 400A
• Material: High-impact engineered plastic
• Inlet Connection: 7/8" ballcock
• Valve Height Range: 10"–15"
• Pressure Operating Range: 20–80 PSI
• Compliance: ASSE and CSA certified

Installation Considerations

The fill valve is designed for tool-assisted installation using standard plumbing tools. Prior to installation, shut off the water supply and drain the tank fully. Ensure all sealing surfaces are clean. The height should be adjusted so the critical level (CL) mark is at least 1 inch above the tank's overflow tube per code requirements. Hand-tighten locknut and verify proper refill and shutoff cycles during final inspection.

Applications for Contractors

• Toilet repair and maintenance in residential, hospitality, and commercial restrooms
• Stock replacement for OEM fill valves in Gerber and other compatible toilet brands
• Preassembled in select Gerber repair kits or available as a standalone unit