CSLB Class B General Contractor's License Practice Exam

If you send your employee to purchase a 2-inch water supply valve and they return with a 1.5-inch supply valve, then what is the proper composition of the valve?

1. The casing must be made of plastic

2. The employee must return and purchase a wrought iron valve

3. Brass type

4. The connection must be silver and body made of iron

The correct answer is: Brass type

The proper composition of the valve being a brass type is appropriate for a few reasons. Brass is commonly used in plumbing applications, especially for valves, because it is resistant to corrosion, has good mechanical properties, and offers a tight seal. The brass composition ensures longevity and reliability in water supply systems, making it a preferred choice when selecting valves. In many plumbing installations, the use of brass components allows for compatibility with other materials while maintaining structural integrity under varying pressure conditions. Additionally, although other choices mention materials such as plastic, wrought iron, or a mixture of specific materials, these may not be as suitable or standard for water supply valves compared to brass, which is widely accepted in industry practice. Thus, the correct answer reflects the common standards and practices for valve composition in plumbing.