The inspection chamber can be almost any type, plastic type is fine. It is the cover and frame you need to be careful about. You need an internal type cover and frame which basically gives you a sealed up arrangement. The type of cover depends on what floor finish you are doing. For a tiled floor, go for a recessed cover and frame that will take the screed and tiles to match the floor. Example of double seal recessed covers can be seen Here
I assume you need an internal chamber because the way your WC and shower are joining up internally. I would consider doing an external chamber if you can, or as freddymercurystwin has suggested, an access gully arrangement so the branch can be rodded.
EDIT - Oops I see you have already beem down this road before with your other thread. - Bit of a waste of time I think.
I don't really understand how a access gully arrangment will work in my case.
I have a drain passing through the ground in the intended bathroom location, i was going to cut in to the run and place a inspection chamber with three sockets, and then from this chamber i was going to run pipes to toilet and shower.
Initially i was going to do without the inspection chamber and run a pipe from the toilet directly into the the run below ground (not into external manhole)
From what i've described is a inspection gully a better option? And whats the best arrangement.
I also need help in best way to tackcle another problem.
At the end of the kitchen i have a utility room that will be used for storage etc. The problem is the gully for the kitchen, washing machine waste is going to be inside the room just outside the kitchen wall.
Is there any special gully i can use for these sort of application? or is there another way to prevent smells going into room.
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