• Material: Nitrile (Buna N); 70 Duro • Size: .056" ID x .176" OD x .060" C/S • Model(s) This Part Fits: 143, 243, 343, 443 & 643 Flame Photometers, Handpiece Control Block Century Plus (38.0540.00), O-Rings, O-Ring Kits, Tools & Lubricant, Utility Module (24-0352-00)