Step 6 · Reassemble the P-Trap
Return to the sink with the clean P-trap. Make sure the slip joint washers are correctly seated on the ends of the pipes; the tapered side of the washer should always face the point of connection where the seal is made. Align the P-trap with the tailpiece and the wall arm, then push it back into position. Begin tightening the slip nuts by hand, turning them clockwise. Ensure they are threaded correctly and not cross-threaded to avoid leaks.