Dump Station/Septic system question. What's the best dump station cap for 3" pvc pipe connecton?

[showme]

I'm building a septic tank for our 5th wheel on our property and plan to use solid pvc pipe from the trailers exit fitting to the septic entrance, which will be run with 3" pvc also. I'd like to put in a small concrete pad around the pipe where the cap will be installed. I plan on this being the future site of my wife's garden shed, which will have water and a toilet after the 5th wheel has been moved, so I've looked at caps on amazon, but I'd like to know from all of you experts what the best way to connect 3" pvc into the septic. We plan on the 5th wheel being there a couple of years, so I didn't want to use flex hose for fear of mice and wood rats chewing through it. Thanks in advance for your thoughts on this. Lee

[Theorid]

PVC's fine for that, but use a proper septic fitting, not just a glued-on cap. You'll want something designed for that kind of pressure and potential shifting of the ground. A concrete pad is a good idea for stability.

[opnspaces]

The only advice I have for the trailer is don't leave the black tank dump valve open. You need to still keep the valve closed until you have at least 2/3 full before dumping. Otherwise you run the real risk of experiencing the dreaded poop pyramid.

[showme]

Thanks, Stircrazy, I appreciate that. I didn't think about the difference between ABS and PVC,  but you are correct. I'll consider using the wye, too, but what I was hoping for was to have a dump tank-like opening like at parks, but this is a good idea.

bit-time, this is what I picked up at Lowe's yesterday on the way to the property. I thought I'd mount it at the top of the pvc leading to the septic tank at ground level with a small, 2' square concrete pad around it. But Stircrazy does have a good point concerning a second entry into the drain for later use, although being out in the sticks and the projected use of the shed/shop that's going to be there after the 5th wheel will only be used for gardening, I was thinking about releasing any grey water either into a tank or just out into nature. This will be between two gardens my wife is planning. There will be so little use of a sink or shower (probably won't have a shower), that the drainage will be minimal. Thanks, guys! I appreciate your help!  Lee

[StirCrazy]

the thredded ends with the caps are what every campground I have been to uses as you thread your sewer hose on to it.  the only other kinds I have seen are the metal lids that lift when you step on the ends comonly used at dumpstations, and tjust bare 3" pipe with a cap sticking out of the ground so no threads and you have to use a rock to hold your sewer hose in.  

[StirCrazy]

I would go with a "Y" setup with a cleanout so it can be used now and later on for different purposes.  

if I was setting it up, and was planing on using it as a regual drain or somthing later I would install one of THESE  under the ground level a bit then bring the two points up a little bit apart from each other  using a 45 degree elbow for the one then cap them both with THIS .  this way if you wanted to and plan acordingly with your spacing you could put a toilte into the one that goes strait down and use the other for sink drains or what ever.  it could be redundent but for the extra 20ish bucks its worth it just incase you want to use it haha.  

I don't like using PVC outside, although many do, and the ABS is a much more heavy duty product.

[bid_time]

I,d use something like this Clicky