Durapro Square Leaf Skimmer With 4 Inch Pocket Package of 12 color_Pewter Gray This is a Pentair Rainbow This is a Pentair Rainbow #752 2 in 1 Chlorine Test Kit that tests for pH and Chlorine using a drop test and color comparator 040 mil Styrene Plastic and is designed to keep the gate closed (per code) and for preventing patrons with diarrhea from entering the pool This Durapro has a 4 inch pocket in a square frame and is designed with Skimlite's plated spring steel frame that won't rust The net is adhered to the frame with their patented method and has protective vinyl tubing around the frame that can be replaced when worn (at the factory)