Coupler may refer to:
Engineering Mechanical Railway coupler, a mechanism for connecting rolling stock on a train Janney coupler SA3 coupler Scharfenberg coupler for multiple unit passenger cars Quick coupler, used in construction machines to allow the rapid change of buckets Coupling, a device used to connect two shafts together at their ends for the purpose of transmitting power Universal coupling, a joint or coupling in a rigid rod that allows the rod to 'bend' in any direction
Electronics Acoustic coupler, for coupling electrical signals by acoustical means Directional coupler, a passive device used in radio technology Antenna coupler, a device connected between a radio transmitter or receiver and its antenna Output coupler, a partially reflective mirror used in lasers Optocoupler, an electronic component that transfers electrical signals between two isolated circuits by using light
Other uses Coupler (piping), also called a (joist) short length of pipe with two female threads Coupler, a device used on a pipe organ Coupler, a device used on a harpsichord Coupler, a tap valve, for controlling the release of beer out of a keg Coupler, the floating link in a four-bar linkage Hydrant coupler, for aircraft fueling equipment
See also Coupling (disambiguation) Decoupling (disambiguation)