A commercial kitchen has a two-compartment sink whose drain must not connect directly to the sanitary drainage system. How must it discharge?

Giải thích

Fixtures that must be protected from sewage backflow discharge indirectly into an approved receptor through an air gap or air break so that no direct connection to the drainage system exists. A direct trap and trap arm connection defeats that protection, a backwater valve does not create the required physical separation, and double trapping of a fixture is prohibited outright.