This O-Ring is made of viton synthetic rubber, has an inner diameter of 37.82 mm, and a 1.78 mm circumference. It is used on a variety of window accessory kits including CaF2 (L1390104), KBr (L1600208), ZnSe (L1600258), KBr - Bently (L1600341), and KBR - Delta (L1600370).
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