1619 Trap Primer - Plumbing - Drain Waste and Vent Plumbing -

Image Text: The trap primer is typically a 3/8 inch diameter plastic tube attached to a fixture (e.g. laundry tub) > whenever the fixture is used, some water is sent to the floor drain trap to keep it filled > the trap primer is often fed into a piece of polyethylene pipe when it must pass through a concrete floor > foundation wall > loose fit > air gap > cross section > trap primer > floor drain > trap seal > waste stack > faucet > trap primer > laundry tub > polyethylene pipe (extension of trap primer)