Air brake hose coupling with locking device

"An air brake hose coupling member includes a locking device having a housing with a first aperture for attachment to the air brake hose coupling member and a second aperture for attachment to a hose support member which is adjusted to provide a predetermined clearance between the air brake hose coupling and a rail track. A locking pin is mounted for reciprocal movement within the housing and is being urged. by a resilient member in one direction for preventing undesirable complete rotational uncoupling of such pair of mating air brake hose coupling members. The locking pin is manually movable in the opposite direction during coupling and uncoupling under normal operating conditions. Alternatively, the housing is provided as a boss formed on a body of the air brake hose coupling."