I dont think so C, I have seen quite a few of em without it and Feesh doent have one on his and we been cleaning fish outta it for years now. The drain pipe only runs about 8 feet over to the outside of the shed. I think the vent and p trap are for when ya run it into a sewer so you dont get that funky smell comin back in it. I filled it up with water about 3 times and it will suck the hat of ya head when it empties lol.


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