English to Chinese Tech/Engineering Mechanics / Mech Engineering

Do bath tubs always include drain and overflow fittings?
Does the LAUFEN product range include bathtub supports?
Which bath tubs can are free-standing (including all-around panel)?
What are the advantages of an acrylic tub?
How are whirl tubs installed?
Do bath tubs always come with a frame?
Under what circumstances is a “pipe interrupter” necessary and what is its function?

Many thanks in advance!