Before revision: Tapered threads The threaded pipes used in some plumbing installations for the delivery of gases or liquids under pressure have a threaded section that is slightly conical (in contrast to the cylindrical section commonly found on bolts and leadscrews).
After revision: parallel sidedTapered threads The threaded pipes used in some plumbing installations for the delivery of gases or liquids under pressure have a threaded section that is slightly conical (in contrast to the cylindrical section commonly found on bolts and leadscrews).