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Petol - Sight Glasses & Flow Sights; 2X.500X8 THREADED SIGHT GLASS - 94714706 - MSC Industrial Supply
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Stainless Steel Oil Sight Glass-1pcs 1'' NPT Male Thread Oil Level Gauge, Surper Transparent Sight Plug, Sight Window, for Tanks, Air Compressors,Pumps,Piping System (1pcs 1'' NPT 304 Stainless Steel) - Amazon.com
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