I did a search and am a bit more confused than before I read all the responses. I have an 1.5" standpipe that passes thru the floor into a p-trap into a 2" waste line. The washing machine has drained fine for 20 years- never overflowed. We are selling the house and the inspector says it must be a 2" pipe and the p-trap is not current code. Does anyone know the best way to "adjust" this situation to keep the new buyers happy? I can change the standpipe to 2" easy enough, but should the trap be above the floor or can it be below, in the crawlspace? What kind of trap is currently required? I am in California. Thanks.
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