Sewer outlet Backflow. Drainage and wastage systems and plumbing help, advice and answers

[omits]

I live in an area where sewage backup is likely to occur. My ground floor toilet needs one but the outlet is vertically into a concrete floor. So I need to fit one just outside where the clay pipe travels under the lawn before the first shared manhole.

I see on Amazon this product https://www.amazon.co.uk/110mm-Backflow-Valve-Non-Return/dp/B00BWNXV00/ref=sr_1_3?crid=VMJDRRGUB4AV&keywords=sewage+backflow&qid=1642535292&s=diy&sprefix=sewage+backflow%2Cdiy%2C54&sr=1-3.

Will I be able to fit this into a clay pipe which is fixed into the soil (unmoveable)? I see there is a slight difference in height of the in and out ports. Advice appreciated as to method etc. Thanks.

[stoneyboy]

Hi omits,
Since you have clay pipes it’s very likely they are 102mm internal diameter. Suggest you try to find a backflow valve to fit this diameter and fit it where your drains enter the manhole.
Regards S

[omits]

Thanks yes I have now identified such. I can see problems with this clogging up and needing servicing as i guess anything 'obstructing' the flow would do. To push it in then having to remove it to clean the entry area seems awkward. Don't think there is a way round this problem. Any views or experience on these devices?