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The ASME standard A 112.18.1 "Plumbing Fixture Fittings" sets maximum flow rates for the
faucets and showers used in the United States. Depending on the application and the dynamic
pressure, the following rates are applicable:
| Application | Flow rate range in gallons/minute | Dynamic pressure |
| Lavatory/Sink faucet | max. 2.2 gpm (8.3 l/min.) | 60 psi (4.14 bar) |
| Shower head | max. 2.5 gpm (9.5 l/min.) | 80 psi (5.52 bar) |
| Public lavatory faucet | max. 0.5 gpm (1.9 l/min.) | 60 psi (4.14 bar) |
The European Standard EN 246 "Sanitary tapware - General specifications for flow rate regulators"
defines the following flow classes at a dynamic pressure of 3 bar:
| Flow class | Flow rate range l/min. |
| Z | 7.5 - 9.0 l/min. |
| A | 13.5 - 15.0 l/min. |
| S | 18.0 - 19.8 l/min. |
| B | 22.8 - 25.2 l/min. |
| C | 27.0 - 30.0 l/min. |
| D | 34.8 - 37.8 l/min. |
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