Plumbing & Pipe Repair Diagnostics

What is the primary function of the water barrier inside a plumbing P-trap beneath a sink?

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 Correct IncorrectThe trapped standing water creates a continuous physical seal that blocks hazardous, foul-smelling sewer gases from escaping into your house.

What is the primary function of the water barrier inside a plumbing P-trap beneath a sink?

• To speed up water draining by vortex action
• To create a gas-tight water barrier preventing sewer gases from entering living areas
• To equalize municipal water supply pressure
• To filter out minerals from tap water