Dwyer Sight Glasses

Overview

The DWYER SFI-300-1/4 is a bronze body sight flow indicator designed for visual verification of fluid or gas flow in piping systems. The unit features a 1/4 inch NPT threaded connection and a glass viewing window that allows technicians to confirm flow presence, direction, and approximate rate without interrupting the line. Rated to 125 psi working pressure and suitable for use up to 200 degrees F, this indicator is appropriate for a range of industrial and mechanical system applications. A Buna-N seal provides reliable performance with common petroleum-based fluids and gases. Licensed plumbing and mechanical contractors typically specify this type of fitting on new installations and retrofits requiring visual flow confirmation. The SFI-300-1/4 is suited for use on coolant tanks, hydraulic lines, hydraulic tanks, oil reservoirs, and pressure vessels. Its compact 3-1/16 inch overall length makes it practical in tight plumbing arrangements. The indicator accepts both horizontal and vertical mounting orientations, giving installers flexibility when routing service lines in commercial and industrial settings. It handles both liquid and gas service, making it a versatile diagnostic and monitoring fitting across multiple system types. Key Features Bronze body construction for corrosion resistance in fluid and gas service Removable glass viewing window for inspection and cleaning 1/4 inch NPT threaded connection for standard pipe compatibility Dual mounting orientation support:…