J.W. Winco, Inc. announced it now offers inch size Brass Oil Level Sight Glasses.
These components have a body made of brass, natural glass sight window, and an optional reflector of heat resistant technopolymer plastic (Polysulfon). The sight glasses are highly stable and scratch proof. They are sealed with an O-ring on the periphery and not on the face edge of the glass, so leak tightness is therefore not affected by axial pressures. They are suitable for use on pressurized oil tanks. The sight glasses are offered in a variety of sizes with NPT threads from 3/8” to 1 1/4”.