Fluidmaster Inc 400A Adjustable Anti-siphon Ballcock

Product Description

The FLUIDMASTER INC 400A is an adjustable anti-siphon ballcock fill valve designed for residential toilet tanks. It controls water refill after each flush by opening to allow tank fill and closing once the set water level is reached. The 400A features an adjustable shank length ranging from 9.5 inches to 14 inches, making it compatible with a wide range of toilet tank depths. Licensed plumbers and experienced DIYers install this type of fill valve as a direct replacement for worn or leaking ballcock assemblies. Its anti-siphon design prevents backflow from the tank into the supply line, meeting common plumbing code requirements.

The 400A is suited for standard residential toilet installations where the existing ballcock has failed, is running continuously, or is causing a slow fill. The adjustable height allows the valve to fit shallow and deep tanks without additional adapters. This fill valve is a common service item for plumbers performing toilet repairs in homes, apartments, and light commercial restrooms. It ships in a package quantity of 25 units, making it a practical stock item for service vans and supply rooms.

Key Features

• Adjustable shank length from 9.5 inches to 14 inches accommodates varied tank depths
• Anti-siphon design prevents backflow from tank to supply line
• Ballcock-style fill valve controls refill cycle after each flush
• Package quantity of 25 units supports bulk restocking for service fleets
• Direct replacement for standard residential toilet ballcock assemblies

Compatibility

Designed as an OEM-style replacement fill valve for standard residential toilet tanks requiring a ballcock-type fill valve with an adjustable shank length between 9.5 and 14 inches.

Installation Notes

Installation is performed by a licensed plumber or qualified DIYer following local plumbing code requirements, including IPC and applicable state amendments. Shut off the supply stop valve and flush the toilet to drain the tank before removing the existing ballcock. Adjust the shank length to match the tank depth before securing the locknut, and do not overtighten the supply line connection to avoid cracking the tank fitting. Verify the anti-siphon cap is properly seated before restoring water supply.

Technical Specifications

• Adjustable Length: 9.5 to 14 inches
• Package Quantity: 25 EA
• Weight: 16 pounds

Standard Information

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