Drain clamps

[the-gnole]

Those look really good Ian, but only on the modern drains it would appear.

[Ian]

It looks like it. but I am surprised that there are enough people wanting to fit NRVs that it is worthwhile manufacturing it and with so many other built it types for the same job. The competition must be fierce.

[the-gnole]

I think it depends on if the system is a dual or two singles, if you have the dual, i.e.combined rain water and sewage then in bad weather like we have had in recent years it might stop raw sewage backing up the pipes, if it is a single sewer and rain water system then the chances are likely to be reduced.

Some of the old "anti-vermin" spring loaded doors would sieze as they were inside the pipes rather than like these which are inside the manhole.

[preppingsu]

I think it depends on if the system is a dual or two singles, if you have the dual, i.e.combined rain water and sewage then in bad weather like we have had in recent years it might stop raw sewage backing up the pipes, if it is a single sewer and rain water system then the chances are likely to be reduced.

Some of the old "anti-vermin" spring loaded doors would sieze as they were inside the pipes rather than like these which are inside the manhole.

so how will i know if the drains are dual or single sewer pipes? What should I look for?

[the-gnole]

What you need to do is look at the set up around your house, do rainwater pipes have a shoe on the bottom discharging onto a grating, this could mean that below the grating is a trapped gully, which is often on a sewage line.

But not easy to test unless it is raining, so, lift the man hole covers and get the hose out, then run water through the gully or down the rain water pipe and see if it runs down through the man hole, also check the man hole by running toilets or kitchen sinks/wash-basins.

I'll see if I can find some books on the subject, it might be easier with the pictures and text.

[preppingsu]

What you need to do is look at the set up around your house, do rainwater pipes have a shoe on the bottom discharging onto a grating, this could mean that below the grating is a trapped gully, which is often on a sewage line.

But not easy to test unless it is raining, so, lift the man hole covers and get the hose out, then run water through the gully or down the rain water pipe and see if it runs down through the man hole, also check the man hole by running toilets or kitchen sinks/wash-basins.

I'll see if I can find some books on the subject, it might be easier with the pictures and text.

Thank You

[Ogre]

deleted by Ogre because the subject was too awful and I can't find the 'delete this post' option.

[the-gnole]

Here you go Su

http://www.draindomain.com/system%20layout.html

[preppingsu]

Here you go Su

http://www.draindomain.com/system%20layout.html

cheers