375 Series Raceway Accessory - 3 Way Tee (Black)

in the HVAC industry we use steel pipe during installation of much of the equipment we service and install you will probably hear it called black steel black iron or black pipe black steel or black iron or black pipe is just slang referring to steel pipe with black paint on it or no pain at all it as opposed to being galvanized the use of galvanized pipe has largely been replaced with PVC you may encounter it though in older homes the steel pipe we are using the HVAC our industry can come threaded or unthread if it is threaded it will have a thread protector on the end like the picture the lower picture full length of steel pipe are 10 foot and 21 foot long pipe diameter is measured by nominal pipe size it is the standard in North America Europe uses a different standard with steel pipe it is measured by the inside diameter the schedule of a pipe is based on the wall thickness of the pi