Should I use 2 plumbing traps at either end of a drain extension?

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Double trapping is both a bad idea and a code violation in most jurisdictions - from the International Plumbing Code (my emphasis):

1002.1 Fixture traps. Each plumbing fixture shall be separately trapped by a liquid-seal trap, except as otherwise permitted by this code. The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches (610 mm), and the horizontal distance shall not exceed 30 inches (610 mm) measured from the centerline of the fixture outlet to the centerline of the inlet of the trap. The height of a clothes washer standpipe above a trap shall conform to Section 802.4. A fixture shall not be double trapped.

The length of pipe between the two traps will not be open to atmosphere on either side - normally, the vent side is open to atmosphere through the vent, and the fixture side is open to atmosphere through the drain. What will happen when you pour water into it is that it will drain fairly slowly because after moving...

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Directly beneath the drain outlet of every kitchen sink and every bathroom lavatory is a trap. This element is vital not only to the proper functioning of the drainage system but also to your health and safety. Each drain trap contains and maintains a plug of water within its curved section that seals against the entrance of harmful sewer gases. If the drap trap leaks, this water barrier may disappear and create a hazardous situation. All drain traps must be kept in proper working order. Restrictions and clogging are immediately noticeable because the drainage flow is slowed or stopped. Clearing the blockage takes care of the problem. Leakage or seepage can often go undetected for a while, so check your traps from time to time and make quick repairs if anything seems wrong.

Drain trap assemblies have several parts. The short piece of pipe that extends downward from the drain outlet flange in the sink or lavatory is called the tailpiece. The curved section of pipe connected...

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Kitchen sink drains, tail piece extensions, and traps are 1-1/2" in diameter. A kitchen sink drain ties two sinks together draining into one trap adapter outlet.

The part used for tieing the drains together is a slip-joint end(or center) outlet waste drain".

A "slip-joint end outlet waste drain" ties a double bowl sink together and the outlet is at either end of the drain.

A "slip-joint center outlet waste drain", the outlet is in the middle between the two sinks.

There are two materials that plumbing drains and traps are made of, and these would be plastic and light gauge steel.

The tools required for installing kitchen sink drain slip-joint end(or center) outlet waste drain are a pair of channel-lock pliers and some plumbers pipe dope.

The pictures below show a 6 inch extension between the "end outlet drain" and the...

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At first, it may seem a little "tricky" uncoiling and straitening the "snake" to the length needed. However, it's really not difficult... It's a lot easier than trying to straiten and bend a coat-hanger into a hook.. (Which is what I've done in the past)!

This gadget may not be as cheep as a wire coat-hanger! None the less, it's inexpensive, reusable, easy to store, and it gets the job done very quickly! 10 - 15 minutes,.. tops!

Very little mess! ..and no toxic chemicals!

A great little device for clearing "hair clogs" from simple bathtub & bathroom sink drains. I didn't need to remove the mechanical drain stoppers... just made sure I uncoiled it fairly strait. Also, I didn't force it, or jam it down the drain!

I proceeded to feed the snake slowly down the drain, with a "gentle", back and forth, up-down, twisting motion. When I felt the blockage.. I slowly twisted the snake as I withdrew the hair plug. I repeated the process twice, and retrieved two...

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