sink and bath waste to hopper waste

[bobo]

My sink and bath waste pipes exit the house and feed into a hopper thing outside. This is then connected to the 4" jacks downpipe. Since I'm doing some renovation would it be ok to get rid of the hopper and feed the waste pipes directly into the 4" waste pipe with tone of those strap on boss connection things? (background - the hopper is above the ceiling of the kitchen extension which is getting fully renovated. When it fills it makes alot of noise. Also there is a risk it could overflow when a full bath is being emptied)

 

[DavyJones]

My sink and bath waste pipes exit the house and feed into a hopper thing outside. This is then connected to the 4" jacks downpipe. Since I'm doing some renovation would it be ok to get rid of the hopper and feed the waste pipes directly into the 4" waste pipe with tone of those strap on boss connection things?

Yes. you could strap them into soil pipe.

 

[bobo]

Yes. you could strap them into soil pipe.

Thanks. Just wondering why the hopper is there anyway. Would it have been designed to take gutter water also prior to the extension?
Also would it be ok to join the sink 32mm waste to the bath 40mm pipe before they enter the soil stack?

 

[DavyJones]

Hoppers were quite common for grey water.

It is not best practise to join those waste pipes. Each waste should go directly to main soil/sewer pipe.

If you join sink and bath together and there is a blockage before main line. when you empty wash hand basin it will back flow into bath/shower etc and visa versa.

Bad plumbing is common but it is not best practice.