Imperial Pools Nexus SPNX1665 18' Full End Stair and Sundeck with 1' + 6' + 1' Steps and 2' Radius. A lounge area. A sun deck. A cuddle cove, or simply a bench. Whatever you want your pool entrance system to be, Imperial has the right one for you. Our vinyl-covered open-top Polymer and Steel Stair Systems extend the pattern of your pool's interior finish onto your steps, creating an uninterrupted, continual, elegant look.