air admittance question

[giarc00007]

wanting to fit the air admittance on the top of the branch pipe on the soil pipe. only problem is the basin waste is above the branch but the trap on the basin is an anti vac trap would this be ok

 

[kimbo]

It has to be fitted 150mm above the overflow of the basin

 

[neal666]

put a hepvo on the basin instead.

 

[dai the plumber]

Can you explain exactly why you want to fit an AAV. Are you having other issues?