Rebuild Kit for PAPAILIAS 150# 1½" FNPT Threaded End Series FIS Sight Flow Indicator with Viton/Fluoroelastomer [FKM] Seal Gaskets and Tempered Borosilicate Glass Lenses for 150PSIG/FV @300°F maximum service. Please contact the factory for seal gasket materials not listed or non-standard lens materials such as Fused Quartz or Polycarbonate [non-glass].All Rebuild kits are supplied with the following:[Qty: 2] Tempered Borosilicate Glass Lenses[Qty: 2] Seal Gaskets[Qty: 2] Inorganic Fiber Lens CushionsAll instruction must be read and understood thoroughly before attempting any installation, operation or maintenance. Failure to follow any instruction could possibly result in a malfunction of the sight flow indicator or glass breakage with resulting sudden release of pressure causing serious personal injury and/or property damage.ALWAYS WEAR SAFETY GLASSES WHEN INSTALLING OR SERVICING OR OPERATING A SIGHT FLOW INDICATOR.