Which material is often used for making old tailpieces and traps?

Soft brass is commonly used for making old tailpieces and traps due to its favorable properties in plumbing applications. It has good corrosion resistance, durability, and can be easily shaped and joined using soldering techniques, which are essential for creating watertight seals in plumbing systems. The malleability of soft brass also allows for adjustment and repair, making it a practical choice for maintaining older plumbing installations.

While aluminum is lightweight and resistant to corrosion, it is not typically favored for plumbing fixtures that need strong and durable connections. Stainless steel, although very durable and also resistant to corrosion, is generally used in modern applications and is less common in older plumbing systems. Copper, while also historically used in plumbing due to its antimicrobial properties and durability, has primarily been replaced with newer materials in many cases. Therefore, the use of soft brass aligns with the typical materials found in older plumbing setups.