Plastic High-Impact Ladder Tread Step - 18 Inch Width Universal state_North Carolina Please note the wording is

Please note the wording is not 4 inches

and other harmful contaminants

And it uses DPD

Spa Lift Ultra

Plastic High-Impact Ladder Tread Step - 18 Inch Width Universal state_North Carolina Please note the wording isThis high impact replacement vertical ladder tread has an 18 inch centerline and can be universally fitted on both 1. 5 and 1. 9 inch O. D. rails. This ladder tread includes adapters that allow the tread to be used with either 1. 5 or 1. 9 inch O. D. tube. The tread has vertical ribs to allow flow and help prevent corrosion. These treads are used on commercial pool ladders and diving towers. The tread is 4 inches deep and has a total length of 19 7 8