Historical
ANSI Z124.4-2006
Plastic water closet bowls and tanks
The purpose of this standard is to establish minimum requirements for plastic water closet bowls, tanks, tank covers, or combinations of same. Conformance to this standard and test procedures herein shall indicate acceptability of a plastic water closet, bowls, tanks, tank covers, or combinations of same as a plumbing fixture.
International Association of Plumbing and Mechanical Officials [iapmo]