Certificate 042/97 Hepworth HEPvO hygienic self sealing plastic waste valve (August 2004 reissue)

Publication Year

2004

Document Status

Withdrawn

Abstract

A self-sealing valve designed to close the waste connection below a sanitary appliance to prevent the escape of foul sewer air back into the building. It eliminates negative pressure within a waste system by opening and allowing in fresh air until a state of equilibrium with the local atmospheric pressure is reached.

Document History

See also building certificates published by WIMLAS. 2nd issue.

Publisher Information