Unlike metallic niches, DuraNiche niches are injection-molded of PVC for superior performance, non-corrosive durability and plumbing versatility - plus the lowest installed cost. The ability to accept PVC over expensive metal conduit enables DuraNiche to offer true bottom line savings in materials, as well as time to install. DuraNiche comes in three models for concrete/gunite pools, vinyl/fiberglass pools, or for concrete/gunite spas. When paired with a Hayward AstroLite or AstroLite ll light fixture, you have the best quality and value in a lighting system available anywhere.