What is the biggest feature of high maintenance?
It is a kind of lead sealing, also known as or. How does it distinguish from other seals? The most important feature is a direct blockade without steel wire, which is also the biggest difference between high sealing and some other lead seals.
Other lead seals do not need steel wire connection in the middle, such as high sealing, its production materials are plastic, stainless steel, mainly Q235A steel and ABS plastic, this material is made of high sealing more.