Devices for heating and storing water shall be so designed and installed as to prevent dangers from explosion through overheating.

No substance which will clog or destroy the pipes shall be allowed

Advertise in self-laudatory language, act in any manner and engage in any practice which tend to bring dishonor to the dignity of the Registered Master Plumber, the National Master Plumbers Association of the Philippines (NAMPAP) and the plumbing profession.

Vent terminals shall extend to the outer air

Suitable provision shall be made to prevent from backflow of sewage

Each family dwelling unit shall have at least 1 water closet and 1 kitchen-type sink; lavatory and bathtub or shower.

All premises intended for human habitation shall be provided with a supply of pure and wholesome water.

Plumbing shall be installed with due regard to preservation of strength and prevention of damage of other structural members.

Sewage that are deleterious shall not be discharged into the ground or into any waterway

Allow the use of his/her License as Registered Master Plumber for a fee to an unlicensed Master Plumber in plumbing works without his/her personal supervision.

Injure falsely or maliciously, directly of indirectly, the reputation of another Registered Master Plumber by reviewing his/her work for the same client unless the professional services of the former have been officially terminated and all professional fees have been fully paid by the client.

Every building having plumbing fixtures installed, where there is a public sewer, shall be connected to the sewer system.

The drainage piping system shall be designed to provide adequate circulation of air.

No water closet shall be located in a room which is not properly ventilated and lighted

Proper protection shall be provided to prevent contamination

Each fixture directly connected to the drainage system shall be equipped with a water-sealed trap.

Supplant another Registered Master Plumber after definite steps have already been taken toward his/her being commissioned to perform the contract.

Plumbing systems shall be maintained by Registered Master Plumbers

Plumbing systems shall be subjected to such tests to effectively disclose all leaks and defects in the workmanship.

Plumbing shall be designed and adjusted to use the minimum quantity of water consistent with proper performance and cleaning.

Suitable provision shall be made for disposing of building sewage if there is no available sewer

Plumbing fixtures shall be made of smooth non-absorbent material, free from concealed fouling surfaces, and located in ventilated enclosures.

The drainage system shall be designed, constructed and maintained, and provided with adequate cleanouts.

Plumbing fixtures, devices, and appurtenances shall be supplied with water in sufficient volume and adequate pressure.

Underbid another Registered Master Plumber by reducing his/her professional fees after being informed of the fees charged by the other Registered Master Plumber.

Act in an unprofessional manner and demand any remuneration other than his/her original charges except for additional services not covered in the basic contract.

All plumbing fixtures must be properly spaced

Take the advantage of a salaried government position to compete unfairly with a practicing Registered Master Plumber.

All pipings of plumbing systems shall be of durable NAMPAP-approved materials.