Details test and examination criteria for gas appliance sediment traps having a maximum operating gas pressure rating of 1/2 psi. A sediment trap is defined as a device intended to protect appliance gas controls from dirt and foreign particles which may be present in gas piping.
ANSI Z21.79b-2010 history
2010ANSI Z21.79b-2010 Gas Appliance Sediment Traps, same as CSA 6.21b