Easily installed throttle designed for apparatus. Provides both instant and micro meter fine adjustment together with a locking action which is not affected by vibration while pumping. The instant adjustment is conveniently made by a push-pull movement of the knob after a slight pressure is applied on the thumb button. The fine or Vernier adjustment is made by simply turning the same knob. Throttles are shipped complete, ready to install in 15 or 20 lengths. Can be cut for shorter lengths. Ship. wt. 5 lbs.