Feature:

Sounding pipe caps are typically made of brass or bronze, primarily because they are corrosion-resistant, resistant to rust, and can ensure a long-term seal without failure even after repeated opening and closing.

Soundings caps are commonly used in ballast tanks, fuel tanks, fresh water tanks, and other environments that are damp or even in direct contact with seawater. The surfaces of brass and bronze naturally form a dense oxide layer that prevents further corrosion, whereas ordinary steel is prone to rusting and seizing, which compromises the seal.

Brass is a copper-zinc alloy that offers good hardness, ductility, and machinability. Its threads are finely machined, making it resistant to stripped threads or brittle fractures even after repeated tightening and loosening.

Since the cap must withstand long-term exposure to the medium inside the pipe and temperature fluctuations, brass exhibits minimal thermal expansion and contraction. This allows the threads to engage tightly, reducing the risk of leakage.