Drainage, Waste & VentQuestion 118 of 360
A trap primer is installed on a floor drain trap in order to:
a.Clean the trap automatically
b.Replenish water and maintain the trap seal
c.Serve as the vent
d.Increase the drain slope
Explanation
A trap primer periodically adds water to a seldom-used trap, such as a floor drain, to replenish the seal that would otherwise evaporate and let sewer gas escape. It does not clean the trap, act as a vent, or change the pipe slope. Maintaining the seal is its sole purpose.
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