$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 1.5″ NBR Sight Glass Seal KIT $6.56 Add to cart 1″ NBR Sight Glass Seal KIT $6.56 Add to cart 3″ NBR Sight Glass Seal KIT $8.88 Add to cart 1″ Sight Glass – POLYCARBONATE $276.41 Add to cart