No PEX there. Never used the stuff. Just old fashioned sweated copper and ABS to your basic washing machine outlet/drain box.

Had a drainage issue in the basement, which resulted in tearing up the floor, digging/graveling a ditch, sinking and adding in a sump pump and repairing some of the 4" sewer line. Since I had things tore up, went ahead and sweated in some copper lines and some ABS to accommodate a new framed all, counter top sink/drain, as well as to move the washer stuff up on the wall to kinda-sort-mostly codeish. Once everything was piped/plumbed, rocked up the wall, slapped down my buddys old kitchen cabinets to mostly hide the sump pump, got a counter top for it, put a sink in it, plumbed it up and there ya have it. New laundry room sink/counter.

Was a great place to fillet salmon - hence the big ass cutting board laying next to the dryer. Also another great place to cure up eggs. UEC didn't stain the stainless sink...and if did, I didn't care.