Designs that may use gudgeon and pintle connections include hinges, shutters and boat rudders. Normally, the corresponding pintle fitting on the rudder slides, lowers or clips into the gudgeon. A pintle injector is a type of coaxial injector. NO/hydrazine thruster using a pintle injector. Towing pintle and airbrake connections are provided. A pintle injector with a narrow spray pattern is used. For siege use it was mounted on a front pintle barbette carriage. It was mounted on a center pintle, barbette carriage. Tripod and pintle mounts are usually used with spade grips. ED nozzles are radial out-flow nozzles with the flow deflected by a center pintle. This generally included both bipod and tripod/pintle mounting options and quick-change barrels. The hinge has a pin "pintle" and can be both external and internal. The connection was secured by inserting a pintle hook key into the pintle. Another category is the towing pintle used on military vehicles worldwide. This is called a Face Shutoff pintle.