A Threadolet is the same basic design as a "weldolet." However the main difference is the fitting has a female threaded connection to mate to the branch connection. This makes a 90° branch and comes in full size or reducing for a straight piece of pipe. Typically, it is in the size range of 1/2" to 6" and is welded over a hole either drilled or burned in the pipe. Pressure class: #3000 (for size upto 6”), #6000(for size upto 2”). Design as per MSS SP-97, BW as per ASME B16.9 and ASME B16.25 Threaded end are is in accordance with ASME B1.20.1