Kohler fixtures must meet ASME codes regarding pounds per square inch (psi). Please review the product's Specification Sheet for the Codes and Standards that your product meets. Some fixtures do require specific pressures and flow rates, as indicated on the product's Specification Sheet.

General Minimum and Maximum Pressure Recommendations

Faucets: ASME codes require supply fittings to function at a minimum of 20 psi to 125 psi maximum (this includes metering and self-closing faucets).
Toilet Fill Valves: Kohler tests fill valves from 20 psi minimum to 80 psi maximum.
Gravity Toilet Tanks: ASME/CSA codes require a minimum of 20 psi to a maximum of 80 psi static.
Electro-Hydraulic Toilets (Power Lite): ASME/CSA codes require a minimum of 20 psi to a maximum of 80 psi static.
Pressure Assist: 1.4 gpf requires a minimum of 20 psi and a maximum of 80 psi. 1.1 gpf or less require a minimum of 35 psi to a maximum of 80 psi static.
Flushometers: Siphonic flush bowl style requires 25 gpm at 35 psi minimum and 80 psi maximum static. Blow out flush bowl style requires 25 gpm at 45 psi and 80 psi maximum static.

Flushometers are more complex as the National consensus standard (shown above) is not the same as plumbing model codes. Model codes typically call the minimum static pressure minimum running pressure. The pressure drops seen across various manufacturers’ valves is also not consistent and depends on the design of the water supply system in the building. In addition, a product may be specifically designed to require different pressures and flow rates; this would be indicated in the specification sheets.