What is a p trap?

Questions covered in this video:

  1. What is a P trap and where is it commonly found?
  2. What is the primary function of a P trap?
  3. Do all plumbing fixtures require a P trap?
  4. How does a P trap prevent sewer gases from entering the house?
  5. What is an integral trap in a toilet?
  6. How does water in the P trap act as a seal?
  7. What happens if the P trap is dry or empty?
  8. How can I ensure that the P trap remains full of water, especially in a vacant house?
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