... . Venting/Drain Valve: 316 stainless steel,HastalloyC, Monel3. Flange and Interface: 316 stainless steel,HastalloyC, Monel4. Contact Medium "O" ring: chemigum ... alloy8. Impulse Wire: Flange1/4NPT, center distance 54mm; interface 1/2 NPT or M20 ×1.5 male screw ball cone seal,center distance ... with interface 50.8, 54,57.2mm (NPT spinal canal ...