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What is the Drain-waste-vent (DWV)?(4)

Source:Lucy Xie Time:2016-7-22 17:34:57

9. Double sanitary tee (sanitary cross)

Similar to a cross. This fitting differs from a standard cross in that two of the ports have curved inlets. The fitting has been used in the past for connecting the drains of back-to-back fixtures (such as back-to-back sinks). Some current codes (including the 2006 UPC) prohibit the use of this fitting for that purpose, instead requiring a special "double fixture fitting" (double combination wye) since that prevents the two sides from flowing into each other more.

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10. Sanitary tee

A sanitary tee is a tee with a curved center section. In drainage systems, it is primarily used to connect horizontal drains (including fixture trap arms) to vertical drains. The center connection is generally connected to the pipe which leads to a trap (the trap arm). However, it is against all major plumbing codes to use a sanitary tee to connect a vertical drain to a horizontal drain, because of the likelihood that solids will accumulate at the bottom of the junction and cause a blockage.

11. Slip joint fitting

Slip joint fittings are frequently used in kitchen, bathroom and tub water drain systems. They include a detached (movable) "slip nut" and "slip joint washer" (the washer is made of rubber or nylon). An added benefit of this type of fitting is that the pipe it is connecting to doesn't have to be cut to precise fit, but the slip joint can attach within a range of the end of the inserting pipe. Many slip fittings are "hand tightenable" for easier entry to the residential drain pipe systems (for instance to clean out the P trap or have access to the drain line past the P trap).

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