Does anyone know what this is?

[shanshan310]

hi there

I'm not sure if anyone is able to help me, but I'm a translator doing an instruction sheet on how to maintain the pipes etc in your home for a local council. I know... basically nothing about plumbing (This isn't the kind of work I usually do for them), and don't want to accidentally use the wrong word and confuse people.
I'm particularly having trouble with something literally called a 'Middle inspection box'. For context the paragraph is:

''Please clean out domestic drainage pipes: Grime can build up inside of your household pipes and cause blockages. We recommend removing the lid from the middle inspection box, and cleaning it with a hose twice a year''.

Googling it in Japanese (中間点検&#26717 gives me pictures of some kind of outdoor cap in the ground leading to a box that looks like it could be a sewer clean out?

does anyone have any idea what this might be referring to? and what it's actually called? Does a sewer clean out sound right?

Thanks!

 

[Mr_David]

I googled 中間点検桝 and got a few images. I could not read anything on the images. It looks like the Japanese use different techniques in how they plumb their drains. I see a lot of square box basins with some odd pipe configuration.
I would say could be called clean outs. Clean out is a term we use for access to the drain to run a sewer cleaning cable through the pipe. Looks like the same purpose.

 

[shanshan310]

Thanks Mr_David! That helps a lot. Interesting to hear that the techniques are different!