This Imperial Reducer is used to effectively reduce the diameter of galvanized round pipe when making connections. The connector is used to transition from 4-in pipe to 3-in pipe in an HVAC system. It is crimped on the small end to easily fit into a pipe or fitting of the same diameter, and is made from 24-gauge galvanized steel for durability. This reducer is easy to install and is suitable for use in most heating, venting and air conditioning applications.