A firefighter multi-tool is configured as a standpipe operations spanner tool and comprises several features for adjusting standpipe pressure regulating valves, and performing other functions performed by firefighters. The tool includes a handle portion and a lateral coupling portion. The lateral coupling portion includes an adjustable wrench having a fixed jaw elements and a moveable/adjustable jaw element. The tool can include a socket portion at the end of the handle opposite the lateral coupling portion. A valve cap spanner can be includes on the lateral coupling portion opposite the adjustable wrench.

A tightening device for tightening a pipe connection, the tightening device comprising a frame (2), a reciprocating member (4) adapted to reciprocate between a first position and a second position relative to the frame (2) by pivoting about a first axis of rotation (101), a socket member (6) adapted for rotating a connector nut (52) of a pipe connection, the socket member (6) having an open side for enabling accessing a rotation axis of the socket member (6) from a radial direction, and a drive coupling between the reciprocating member (4) and the socket member (6). During use of the tightening device a reciprocating motion of the reciprocating member (4) between the first position and the second position provides unidirectional rotation of the socket member (6) in the first direction of rotation.

A valve installation and removal device for preventing rotation of a valve while installing or removing the valve includes a tube, which is internally threaded so as to be threadedly attachable to an outlet connector of a valve assembly. The valve assembly has a compression fitting that is nonlinear with the outlet connector. A pair of openings is opposingly positioned in the tube substantially equally distant from opposed ends of the tube. A drive is attached to and extends substantially perpendicularly from an elongate handle proximate to a first end of the elongate handle. The drive is complementary to, and thus selectively insertable through, the openings, which are noncircular, to engage the elongate handle to the tube. The elongate handle can be grasped in a hand of a user to prevent rotation of the valve assembly as a nut of the compression fitting tightened or loosened.

A fitting nut made of a resin material includes: a hollow, large-diameter tube portion having a female thread formed on its inner peripheral wall; and a small-diameter tube portion that is continuous to the large-diameter tube portion and having a hollow cylindrical shape with a smaller diameter than the large-diameter tube portion. The small-diameter tube portion includes, in the outer peripheral wall thereof, a plurality of engagement grooves that are depressed inwardly in the diameter direction of the small-diameter tube portion and extend along the longitudinal direction that is orthogonal to the diameter direction.

A tightening device for tightening a pipe connection, the tightening device comprising a frame (2), a reciprocating member (4) adapted to reciprocate between a first position and a second position relative to the frame (2) by pivoting about a first axis of rotation (101), a socket member (6) adapted for rotating a connector nut (52) of a pipe connection, the socket member (6) having an open side for enabling accessing a rotation axis of the socket member (6) from a radial direction, and a drive coupling between the reciprocating member (4) and the socket member (6). During use of the tightening device a reciprocating motion of the reciprocating member (4) between the first position and the second position provides unidirectional rotation of the socket member (6) in the first direction of rotation.

An engaging structure for a hand tool includes a main body provided with a mounting element, six drive portions, six receiving portions, two first arcuate faces, a second arcuate face, a first radius, a second radius, a first distance, and a second distance. Each of the six receiving portions has an arcuate concave shape and is arranged between one of the two first arcuate faces of one of the six drive portions and one of the two first arcuate faces of another one of the six drive portions. Each of the six receiving portions forms a first circle and a third radius. The mounting element has a center forming a second circle forming a first hexagon having six sides. The center is served as an axis defining a second hexagon. The second hexagon is less than the first hexagon.

An engaging structure for a hand tool includes a main body provided with a mounting element, six drive portions, six receiving portions, two first arcuate faces, a second arcuate face, a first radius, a second radius, a first distance, and a second distance. Each of the six receiving portions has an arcuate concave shape and is arranged between one of the two first arcuate faces of one of the six drive portions and one of the two first arcuate faces of another one of the six drive portions. Each of the six receiving portions forms a first circle and a third radius. The mounting element has a center forming a second circle forming a first hexagon having six sides. The center is served as an axis defining a second hexagon. The second hexagon is less than the first hexagon.

A valve installation and removal device for preventing rotation of a valve while installing or removing the valve includes a tube, which is internally threaded so as to be threadedly attachable to an outlet connector of a valve assembly. The valve assembly has a compression fitting that is nonlinear with the outlet connector. A pair of openings is opposingly positioned in the tube substantially equally distant from opposed ends of the tube. A drive is attached to and extends substantially perpendicularly from an elongate handle proximate to a first end of the elongate handle. The drive is complementary to, and thus selectively insertable through, the openings, which are noncircular, to engage the elongate handle to the tube. The elongate handle can be grasped in a hand of a user to prevent rotation of the valve assembly as a nut of the compression fitting tightened or loosened.

A fitting nut made of a resin material includes: a hollow, large-diameter tube portion having a female thread formed on its inner peripheral wall; and a small-diameter tube portion that is continuous to the large-diameter tube portion and having a hollow cylindrical shape with a smaller diameter than the large-diameter tube portion. The small-diameter tube portion includes, in the outer peripheral wall thereof, a plurality of engagement grooves that are depressed inwardly in the diameter direction of the small-diameter tube portion and extend along the longitudinal direction that is orthogonal to the diameter direction.