State the three main specifications considered before selecting a material for plumbing work.

1. Corrosion resistance: The material must be able to withstand the corrosive effects of water and other chemicals commonly found in plumbing systems to ensure long-term durability.

2. Strength and durability: The material must be strong enough to withstand the pressure and stress of water flow and temperature changes without cracking or breaking.

3. Cost-effectiveness: The material must be cost-effective in terms of initial purchase price, installation costs, and maintenance requirements over the lifespan of the plumbing system.

1. Strength and Durability
2. Corrosion Resistance
3. Suitability for the Intended Purpose