The VMV S1 is an inline sight glass designed for visual inspection and monitoring of fluid flow in pipelines. It features a yellow brass cubic body and stem, a round borosilicate glass viewing window, and a stainless steel seal. Available in DN10-DN20 sizes with NPT1" threaded connections, this sight glass is rated for PN5 with an operating pressure range of 0.25-0.35 MPa and a maximum temperature of 140°C.