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Backflow preventer instead of air gap

Rick Taylor said:
[attachment]3-8-2010 001.jpg1.jpg[/attachment]New restaurant with food prep sink drain to backflow preventer to grease trap to floor sink.

I think the sink needs an air gap between the sink and pee-trap.

Whats your take?

Thank you,

Rick
Click to expand...
Shouldn't it be sink/airgap/floor sink or drain/grease trap?

The grease trap is often times located outside the building (especially with heavy frying).. so it can be serviced.
 
I am wondering why you have a grease trap on a food prep sink? Food prep sink/airgap/floor sink. Pots and pans sink/flow restricter/air gap/floor sink/grease trap
 
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