An applicant must design and install plumbing, including:

(1) Backflow prevention. Devices on plumbing fixtures, equipment, facilities, buildings, premises, or areas which may cause actual or potential cross-connections of systems in order to prevent the backflow of water or other liquids, gases, mixtures, or substances into a water distribution system or other fixtures, equipment, facilities, buildings, or areas;

(2) Trap primers in floor drains and stand pipes subject to infrequent use;

(3) Wrist, knee or foot faucet controls or equivalent and gooseneck spouts on handwash sinks;

(4) Insulation on:

(a) Hot water piping systems;

(b) Cold water and drainage piping; and

(c) Piping exposed to outside temperatures.

(5) Equipment to deliver hot water at point of use as follows:

(a) 120°F or less for handwash sinks and bathing fixtures;

(b) 160°F or more for laundry washers;

(c) 120°F or more for laundry washers using chemical sanitation.