I also got the exterior plumbing attached yesterday!
I went with a Hepvo trap.
https://www.amazon.com/gp/product/B00NLMPLDU/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1I did coat the hole with silicone to prevent water damage in the future.
I used an eccentric fitting so the water flowing out will have a drop, don't know if it was necessary but it couldn't hurt.
I'm not going to have an onboard collection tank so I'm just using a short piece of 3" abs to make all of my connections. I intend to only use a garden hose connection for draining the water but I went ahead and installed a standard gate valve so I could also hook up a regular sewer pipe if I'm forced to use one, nothing wrong with a little redundancy right?
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