NiYo Engineers’ Orifice and Mouthpiece Apparatus is a stand-alone, re-circulating type equipment that helps in study of change in discharge of a liquid through an orifice and mouthpiece of Uniform cross-section, under varying pressure heads. Different sizes Orifice plates and Mouthpiece are supplied for the study. A specially designed tank helps maintain constant head. An arrangement is provided to measure the trajectory of the jet of water. Trainees can quickly change the Orifice/Mouthpiece.