Restrained Spring Mounts come with a wide variety of ratings and spring deflections, and are encased in a housing with adjustable limit stops. When set correctly, the springs will be floating and isolating correctly, but if the equipment changes weight significantly (perhaps when fluids are drained during maintenance) or is moved (usually from wind when outside) the limit stops prevent the spring from moving excessively.

Limit stops incorporate rubber pads so there is never a solid connection between the equipment and the ground.