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Ask the expert: **Attention all readers!!!! If you have a plumbing or heating question, please call our office! We may use your question in the paper! ** Q I have a sink in my new home that is acting strange. EVERY TIME I flush my toilet or drain my tub, the sink drain makes a “glugging” sound for about 30 seconds after the flush. What’s going on? Can this be resolved? I believe the previous homeowner installed the bathroom himself. -Louis S- A Hi Louis, Assuming that the homeowner had piped the bathroom group himself, I’m guessing he didn’t install a vent. Every fixture needs a vent! A vent allows atmospheric pressures to balance out inside the piping system. If a slug of water is rushing forward down a pipe, the slug mass needs to be replaced by something and that replacement is air. The air in front of the slug of water is being replaced by the water slug. If there is no vent, the pipe is starving for air while that slug is moving down stream. The pipe needs the air so it starts to steal it from some place with the least resistance. This is usually a sink . It will suck the water out of a trap to steal the air behind it . The way to resolve this, if a vent hasn’t been piped into the system, is to install a mechanical vent. A mechanical vent allows the system air when needed, but doesn’t allow sewer gases to escape. If we can help you get rid of your “glug” please call us. — Wes Rosenberg, Owner/Master Plumber 262-989-1001 wisconsinmechanicalservice.com