Not sure about your age of rig. On the newer ones they have a substitute for a Ptrap ( http://www.amazon.com/dp/B004A2YFG4/...I1K80KZJO3JBIH) that if you attempt to run something into it a membrane will tear and it will need to be replaced. You can guess how I know. Since then we've installed the little drop in screens ( http://www.amazon.com/Camco-42273-As...DEGR9MVR6B75T2) in all our drains and while we have to clean them frequently, no more slow drain problems.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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