How to connect Zoeller poly sewage basin?
Greetings from eastern NC. On the advice gleaned from extensive browsing of previous posts, I recently ordered a Zoeller pump package. This is for my basement remodel project, which will have a typical bathroom only (tub/shower, toilet, sink). From the pit it will pump up about 8' to join my main 4" building drain, which runs into a septic tank.
I ordered one with a 0.5 hp pump, but it was back-ordered. My friendly, helpful, and (hopefully) knowledgable Ferguson supply guy took it upon himself to substitute an identical system with a 0.4 hp pump, assuring me that it would be more than adequate. Is that so?
Main questions though, have to do with the inlet, discharge, and vent connections. The inlet is 4", and the tank is polypropylene. Do I use here a Fernco-type coupling, or a PVC fitting and cement it on? I hate to ask stupid questions.
The lid is also poly, and has 8 stainless bolts. Instructions say to check the vent hole in the discharge pipe periodically, and also for pump maintenance and future replacement, etc, one needs to be able to get into the pit on occasion. The lid has two 2" holes for discharge and vent. Both of these are threaded on the outside, top, of the lid. The discharge pipe will have a union, check valve, and ball valve. In order to get the lid *off* after unbolting, I'll need a union on the vent pipe also, right? I'm just trying to visualize this, and mentally walk through the process of actually taking the lid off once everything is connected. The cords are connected to the power source and alarm, and go through the lid, too.
Would the two unions allow easy disassembly? Or would two Fernco-type connections be used instead? My supply guy says that most plumbers use two Fernco connections, but that doesn't seem right to me. I've never used these, and thought they were inappropriate for any pressure connections. Or is the pressure on the discharge side low enough that I don't worry about it?
Lastly, inside the tank, the discharge pipe comes up and slides inside a sleeve built into the lid below the threaded connection. Does anything need to be done here or is that an adequate connection?
Thanks in advance for advice offered.