Oatey K835-12 3 Inch Flush Valve Adjustable Flapper

Product Description

The OATEY K835-12 is a 3-inch toilet flush valve designed as a direct replacement for residential and light-commercial tank toilets. It operates with a 3.16-inch-8 NPS thread and includes an adjustable water-saving flapper with a timing cone, allowing the installer to control flush duration and reduce water consumption per cycle. Licensed plumbers and experienced DIYers install this valve during routine tank rebuilds or when an existing flush valve shows signs of wear, warping, or persistent leak-through. The assembly ships as a complete unit ready for direct installation into a matching toilet tank.

This flush valve fits Toto, Gerber, Mansfield, Crane, and Jacuzzi toilets, as well as any toilet tank equipped with a compatible 3-inch flush valve seat and 3.16-inch-8 NPS thread. It is suited to residential bathroom applications and light-commercial restroom maintenance where a standard 3-inch valve seat is present. The adjustable flapper timing cone makes it adaptable across flush volumes, supporting water-efficiency goals without requiring a full toilet replacement.

Key Features

• 3-inch valve size fits a wide range of residential toilet tank configurations
• 3.16-inch-8 NPS thread for secure, leak-resistant tank seating
• Adjustable water-saving flapper reduces per-flush water consumption
• Timing cone included for customizable flush duration at installation
• Compatible with multiple major toilet brands without modification

Compatibility

Designed for Toto, Gerber, Mansfield, Crane, and Jacuzzi toilets, or any toilet flush valve seat with a matching 3-inch opening and 3.16-inch-8 NPS thread size.

Installation Notes

Installation is performed by a licensed plumber or qualified DIYer familiar with toilet tank components. Shut off the water supply at the angle stop and fully flush and sponge-dry the tank before removing the existing valve. Follow local plumbing code requirements, including IPC guidelines where applicable. Do not overtighten the locknut against the tank; hand-tight plus a quarter turn is a standard practice for plastic tank fittings to avoid cracking the porcelain.