I'm replacing a bunch of rusted-out or melted bits on my black/grey water drainage system, and I can't figure out what I need at the sewer terminal. Right now there's a 3" gate valve
and a termination cap
, but it doesn't look like those two parts fit right together without anything in between---and it doesn't look like I'll be able to hook a sewer hose directly to the gate valve when the cap is off. Unfortunately, the old sewer terminal is borked beyond repair, so I can't disassemble it and figure out what's going on; I need to rebuild from scratch.
What am I missing here? Is this just a part that people don't need very often (and is thus hard to find), or am I an idiot? Happy to admit to the second possibility at this point