Fixtures & Water HeatersQuestion 213 of 360
A residential dishwasher discharge must be protected against backflow. Which method is an approved way to do this?
a.connect the drain hose to the floor
b.run the hose in a straight downhill line
c.install a check valve only
d.an approved dishwasher air gap fitting, or a high loop where permitted
Explanation
A dishwasher drain must have an air gap to prevent waste water from siphoning back into the machine. An approved air-gap fitting mounted at the counter is the standard method; a high loop is accepted in some jurisdictions. A simple check valve alone is not adequate backflow protection.
Law Reference: 2022 California Plumbing Code (CPC) §807.3Practice all 360 questions free — no signup required.
Related questions on this topic
- Plumbing fixtures must be constructed of materials that are:
- A wall-hung urinal in a standard adult commercial restroom is typically set with the lip of the fixture at a maximum height above the floor of about:
- Compared with a two-piece water closet, a one-piece (integral tank and bowl) water closet generally offers which advantage?
- A water heater's T&P relief valve must be installed so that it is:
- Which of the following is prohibited between a water heater and its T&P relief valve?
- A water heater must be installed so that:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review