The 1 in. oil-level sight glasses have a brass body, glass sight window and an optional reflector of heat-resistant polysulfon. The scratch-proof glasses are highly stable and sealed with an O-ring on the periphery (rather than the face edge of the glass) for leak tightness that is not affected by axial pressures. Suitable for use on pressurized oil tanks. Available in a variety of sizes with NPT threads from 3/8–1¼ in.

J.W. Winco www.jwwinco.com