A device, fitting, or assembly of fittings installed in the building drain to prevent circulation of air between the drainage system of the building and the building sewer.
(International Plumbing Code® 202.0)
Building Trades Resource
Building Trades Resource
A device, fitting, or assembly of fittings installed in the building drain to prevent circulation of air between the drainage system of the building and the building sewer.
(International Plumbing Code® 202.0)