Fluidmaster Inc 400ACN3P5 Anti-siphon Ballcock 3 Pack

Product Description

The FLUIDMASTER INC 400ACN3P5 is a 3-pack of adjustable anti-siphon ballcock fill valves designed for residential toilet tank service. Each valve adjusts from 9.5 inches to 14 inches in length, allowing installation across a range of toilet tank depths without requiring separate part numbers. The anti-siphon design meets code requirements that prevent backflow from the tank into the supply line. These valves are a staple service item for plumbers and property maintenance techs who need a reliable, code-compliant fill valve replacement they can carry in quantity on the truck.

This 3-pack configuration is suited for multi-unit residential work, apartment turnover service, and plumbing contractors running repeat toilet rebuilds. The adjustable height range covers most standard two-piece toilets where the 400A-style valve is the common OEM or aftermarket specification. Each unit in the pack installs independently, making it practical to stage them across multiple units in a single service call without returning to supply.

Key Features

• Adjustable height from 9.5 inches to 14 inches to fit a range of tank depths
• Anti-siphon design supports compliance with plumbing backflow prevention codes
• 3-pack quantity reduces supply runs on multi-unit service calls
• 400A-style form factor widely compatible with standard residential toilet tanks

Compatibility

Designed as an OEM-style replacement fill valve for standard residential toilet tanks that accept a 400A-style anti-siphon ballcock.

Installation Notes

Installation is performed by licensed plumbers or qualified maintenance technicians. Shut off the supply stop valve and flush the tank to remove water before removing the old fill valve. The IPC and local plumbing codes govern fill valve anti-siphon requirements — confirm local code compliance before installation. Do not overtighten the lock nut securing the valve shank to the tank; hand-tight plus a quarter turn is the standard approach for plastic-body fill valves.

Technical Specifications

• Quantity per Pack: 3
• Adjustable Height Range: 9.5 inches to 14 inches
• Weight: 10 pounds

Standard Information

• Brand: FLUIDMASTER INC
• Manufacturer Part Number: 400ACN3P5