I purchased this vessel 5-2019 and the surveyor put in his report to change this PVC fitting at the next haul out. It is in the aft cabin starboard hanging locker. It is the overboard thru hull for the aft head. You have the thru hull fitting a 90deg. 1 1/4 in PCV street elbo and then the ball valve. It looks like schedule 80 PVC fitting. I contacted the company in California that makes Marelon fittings and they do not make a 90 deg. street elbo. Dose any one know if this is what Catalina put on the boat from the factory? The boat is a Catalina Morgan 381. 1993 model year Hull # 25.