Fused glass to metal sightglass can be used as a tank cover or manway. One piece construction offers reliability, safety and ease of opening and closing. The covers/manways are offered with ASME or without ASME approval. Material of construction is 316L stainless steel with optional materials available. The “Pharma” model is ideal for pharmaceutical applications due to its low profile weld ring that prevents particle accumulation. These covers/manways are available in a number of sizes and are rated to 150 psig, higher pressure ratings are available on request.