Top Line has a wide variety of in-line sight glasses offering bolted, cross style shouldered or flanged in sizes ranging from 1/2" to 6" in types 304 and 316L stainless steel. Product comes standard with clear acrylic glass, buna-N seals and clamp connections. Polysulfone glass, Viton or silicone seals, and other end connections are available upon request. Bolt style can also be supplied with clear acrylic protection shield for added security.