Hey If I tee the basin waste in to the bath waste as they leave the bathroom to exit in to a copper. Will the basin trap be ok with it begin an anti-vac trap?
good practise to have seperate wastes going straight into the stack as when you empty the bath the basin will gargle as it draws air in annoying more than anything
Since you have a natural air break with the hopper you have options for the traps you can use. an anti-vac trap could be used but as stated above you will get syphon action when the bath wast runs.
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