The 100314415 Long Radius 90 Degree Elbow Fitting is made with 304 stainless steel and has a size NW40 ISO-KF vacuum flange on each end. Long radius 90 degree elbow fittings are twice standard modulus and are used to make a right angle change of direction between two ISO-KF flange faces. Series 31 ISO-KF vacuum components are designed for use at subatmospheric pressure and use standard interface dimensions defined by the International Standards Organization (ISO) allowing them to be interchangeable with other ISO-KF compliant components. Series 31 components can be used as modular building blocks to create vacuum piping systems. IS-KF flanges are "sexless" with a symmetrical seal so that so that components are rotatable. ISO-KF vacuum flanges are joined by inserting a centering ring between the two flange faces, and securing them with a flange encompassing clamp.