Which type of wrench is specifically designed for tightening pipe fittings?

The Stillson wrench is designed specifically for gripping and turning round objects, particularly pipe fittings. Its unique design features serrated jaws that create a strong grip around the pipe, making it suitable for tightening or loosening pipes and fittings without slipping. The leverage provided by the long handle allows for significant torque to be applied, which is essential in plumbing applications where firm connections are necessary to prevent leaks.

While the adjustable wrench can also be used for various fittings, its jaws may not provide the same grip as a Stillson wrench in all situations, particularly with round shapes. The box-end wrench, on the other hand, is designed to fit over fasteners such as nuts and bolts, not specifically for pipe fittings. The pipe wrench is a common term often used interchangeably with Stillson wrench, but the correct terminology emphasizes the Stillson wrench's specific design and purpose for gripping pipes.