Such an installation can be performed by plumbers working alone or working in the company hydraulic system.
Gaskets are mechanical seals, usually formed like a ring and used for sealing of flange joints.
In general, gaskets should not be reused.Various types of gaskets are available depending upon their construction, materials, and features.
They are available with an inner ring and outer ring, which is also known as the cantering ring.Ring Joint Gaskets are used with Ring Type Joint (RTJ) flanges. They are available in octagonal or oval cross sections. A very high surface stress is developed between an RTJ gasket and the flange groove when RTJ is bolted up in a flange. This leads to plastic deformation of the gasket. Thus, the hardness of the gasket is kept less than the hardness of the groove to achieve coining i.e.
bringing two metal surfaces of different hardness so tightly together that the softer surface deforms to match harder surface exactly in shape and finish.
You just have to reckon with the fact that the services contract with an independent plumber probably will prolong the work carried out.
However, this should not affect their quality, and sometimes it turns out that the plumber running his own business applies doubly to perform the outsourced tasks themselves.They may rely on both the exchange of a faulty seal and at the connection of the new tap..