Plug is made of also stainless steel, so that it can be used semi-permanently and its maintenance work can be done by depleting alien substances regularly.
Body
The opening part through which liquid passes is big enough to minimize pressure loss and make liquid flow smoothly. This is made of stainless steel, so that it can be used at high pressure
and high temperature.
This stains any alien substance contained in the liquid flowing inside the piping so that Valve can work smoothly.