The bodies of the Cone Throat 75 nipples are featured with a stronger, thicker hex-head body, making installation and removal much simpler. With the design change of the body, came the opportunity to simplify and improve the internal parts. These nipples now only use a trigger, a Viton O-Ring, an hourglass spring, and a white orifice for pressurized watering applications, that can be interchanged with a gravity flow orifice for gravity applications. | Trojan Model 75 Cone Throat Nipple 2 Pack