$240.31 4″ HSG Sight Glass Polycarbonate Insert 4" HSG Sight Glass Polycarbonate Insert quantity Add to cart SKU: HSG-POLY-400 Category: Sanitary Sight Glass Tags: sanitary sight glass, sight glass Additional information Additional information Weight 0.07 lbs Dimensions 7.5 × 7.5 × 7.5 in Related products 2″ FKM Sight Glass Seal KIT $22.09 Add to cart 6″ 316L In-Line Sight Glass CxC No Shield $745.61 Add to cart 6″ NBR Sight Glass Seal KIT $24.05 Add to cart 1.5″ Sight Glass – POLYCARBONATE $313.81 Add to cart