Tank-to-Bowl Gasket

Product Overview

The Gerber 99-591 Tank-to-Bowl Gasket is a professional-grade sealing component engineered for secure and watertight connections between the tank and bowl assemblies in Gerber Ultra Flush systems. Designed specifically for use with models 28-380/4/5, DF-28-380/4/5, and EF-28-380/4/5, this gasket provides a reliable seal under system operating pressures, maintaining performance integrity and preventing leakage during service. The gasket is manufactured from high-quality elastomeric material and sized precisely to ensure correct fitment in compatible Gerber flush systems.

Technical Specifications

• Manufacturer: Gerber Plumbing Fixtures
• Model Number: 99-591
• Description: Tank-to-Bowl Gasket for Ultra Flush Systems
• Reference Number: 1842559
• Application: For sealing the interface between the water tank and bowl in Ultra Flush toilet systems
• Compatible Models:
  • 28-380/4/5
  • DF-28-380/4/5
  • EF-28-380/4/5 Ultra Flush Tanks
• Material: High-density elastomer (green rubber compound)
• Color: Green
• Inner Diameter (ID): 2-1/8 in (54 mm)
• Outer Diameter (OD): 3-1/4 in (83 mm)
• Height: 1-3/8 in (35 mm)
• Function: Creates a compression seal between the tank outlet and bowl inlet to prevent water leakage
• Design Type: Molded ring gasket with uniform sealing surface
• Operating Pressure: Standard gravity and pressurized flush tank pressure conditions
• Temperature Range: Compatible with typical potable water system temperatures
• Installation: Fits between tank outlet and bowl horn; compresses under tank bolt tightening to form watertight seal
• Service Application: For maintenance, replacement, or assembly of Gerber Ultra Flush toilet systems
• Compliance: Meets industry standards for elastomeric plumbing gaskets

Summary

The Gerber 99-591 Tank-to-Bowl Gasket is a precision-molded green elastomer gasket measuring 2-1/8 inches ID by 3-1/4 inches OD by 1-3/8 inches H. Designed for Ultra Flush models 28-380/4/5, DF-28-380/4/5, and EF-28-380/4/5, it provides a durable, watertight seal for professional tank-to-bowl connections in Gerber plumbing systems.