http://www.hometips.com/home_probsolver/hps04/01_drains/hps_drain01.html * They mention Vents. It cold be that there is no vent or that the vent is stopped up. * When vents ae stopped up, the water rushing out to the sewer pipe creates a vacuum that sucks the water out of the trap. * Good luck... Adios... Jasper... Jasper Castillo
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