Box Grate Outlets - Galvanised SteelMade from fully hot dip galvanised steel, our outlets are available to suit the following box grate sizes: 125mm wide x 80mm deep 150mm wide x 125mm deep 200mm wide x 170mm deep 300mm wide x 170mm deep All outlets are 90mm to suit 100mm pipe. Where the outlet is required you can use a hole saw or grinder to cut out a hole in the base of the drain. Then the outlet piece can be screwed onto the base underneath where the hole is drilled to go into your