The Waterco Supatuf H&L Pot Foot Bolt M6x20 S/S31 is a replacement bolt or screw that can be found on several Waterco products. These include Hydrotuf, Lacronite Pump, Hydrostorm, Hydrostorm Plus, Turboflo, Hydrostar 350, Hydrostar Commercial MK2 (Mk1 - Pre 03/2004), and Hydrostar Commercial MK3 (Post 08/2006). This is made with 316 stainless steel material. This is a hex screw type with a head diameter of 6 millimeters and a length of 25 millimeters.