The basic components of procedure trays include, at a minimum: items for skin preparation; Items for draping; supplies to give local anesthetic; items for surgical closure. Skin preparation items would include 2x2 or 4x4 non-sterile gauze sponges or 6 cotton-tipped applicators that can be used to prepare the skin with an antiseptic solution. Usually the gauze are picked up by a sponge stick and used to paint the antiseptic on the skin.
Water Supply. The supply line to the toilet is standard 1/2-inch copper pipe. This standard is used throughout the home to supply faucets, showers and any other appliance requiring water, including the washing machine. This 1/2-inch pipe connects to the home's 3/4-inch water pipes. The water supply line does not run directly to the toilet, however.
Applying the nominal size across domains requires understanding of the size systems in both areas; for example, someone wishing to select a drill bit to clear a  1â4 -inch screw may consult tables to show the proper drill bit size.or example both 1â2 inch and 15 millimetres (0.59 in) copper pipe is actually the same pipe which has a nominal internal diameter of 1â2 an inch and a nominal external diameter of 15 millimetres (diameter is always internal in the imperial measurement system and always external in metric).