A water clostet (private use) with 1.6 GPF gravity tank is drainage fixture units and trap and trap arm.

A researcher does a correlational study and finds that women who have unprotected sex (without a condom) are happier (this is a real study, believe it or not!). From a scientific perspective, what is the main flaw in this study? 

A clothes washer is drainage fixture units (Idaho Rules) and inch trap and arm.

Pipe #7 should be _________ pipe.

A 3″ horizontal soil pipe may only have toilets on it, whereas a 3″ vertical soil pipe may have .

Vent pipes must be at least ____________ inches above the flood rim level before offsetting horizontally or joined together.

Vents must terminate at least inches from any vertical surface, at least inches above the roof, not less than feet above any openable window, door or air intake and not less than feet horizontally from any openable window, door or air-intake.

In drainage, a sanitary tee may be used in what direction change(s)? Pick all that apply.

Horizontal vents must be level or graded back to the drain they serve.

A vent that also serves as a drain.