Our new kitchen sink installation doesn't drain properly. After the two drains empty and pass thru' the trap, it rises 2" before heading downward to the main stack to exit the building (see image right side of centre) . Is this legal ? How can it be easily fixed since everything is hidden in the wall ? The contractore says it's okay.
The picture nor its link posted, please update. Otherwise, I'll give it a shot anyway. The pipe after the trap MUST go straight into the wall's fitting from the trap. Any step-up after the trap is improper and therefore illegal.
- If the trap is just extended or too long on the exit side, this isn't necessarily illegal though still improper and not optimal. In either case the sinks' or inlet side of the trap needs to be shortened or the wall has to be opened to lower the wall 's Fitting (last resort and should be avoidable).
- 2 options: - 1) Shorten the sink side of the trap, by cutting-down whatever verticals you have. - 2) By itself or along with #1. A) Screw Union Fittings directly onto the sink drains with Thread Sealant and install separate traps for each sink (1 "slip" Union's and 1 threaded Union's swapped parts). B) Then, join the sinks' traps at a Sanitary Tee (requires another Elbow Fitting) or a Wye Fitting (best) below the back of the sinks followed by a downward Elbow Fitting. C) From there, it would be a single pipe dropping down to another Union Fitting (slip) that's Cemented to an Elbow Fitting at the wall (a Street Elbow fitting may work best).- Preferably, this would all be done with PVC (the white piping held together with a bunch of nuts is Polypropylene, low-grade stuff) using Primer and Cement, so you never have any leaks nor future involvement. No, don't opt for a trap (U-bend Fitting) that has a drain plug. They're worthless and not needed with 3 hand-snug only Unions.
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