Advantage Home Improvements markets and installs Onyx shower and sink products; as well as Gentek vinyl siding and windows. We would be happy to discuss the versatility and durability of the Onyx products. Onyx Collection manufactures shower bases, shower wall panels, lavatories, tub surrounds, tub seats, and accessories in almost any color, texture or size. What’s even better, Onyx products are warranted FOR LIFE. We also specialize in many other types of home improvements. We take care of hail damage from small partial jobs to a complete siding job.