This straight threaded window sight may be screwed into a tapped hole or used with the plated steel mounting nut for a drilled hole. The provided Velumoid 505 fiber gasket fits between the window sight and tank, preventing leakage past the threads. The unit can be used with a maximum wall thickness of 1/4". It withstands up to 100 PSI and 225° F.
The body of the window sight is constructed of corrosion and rust resistant aluminum alloy. The glass viewing sight is secured by a brass retaining ring. A Buna-N o-ring creates a leak tight seal. A nylon washer is seated between the retaining ring and sight to prevent glass abrasion. This window sight is also available with a stainless steel reflector to enhance liquid visibility.
This unit features a 1 1/4”-12 mounting thread and plated steel mounting nut. It has a 1 1/2” hex and 1” sight diameter. When tightly secured, it extends about 1/2” from the mounting surface.
Other body materials, Viton, and EPDM seals are available upon request.