Materials
Window Housing and Cover UL 94 5VA Nylon (switchgear-grade plastic); -40°C (-40°F) to 273°C (523°F); Easy-GripTM stainless steel cover
Optic Calcium Flouride Crystal (other crystal options available); -100°C (-148°F) to 1400°C (2555°F)
Gaskets UL 94 5VA TPE; -40°C (-40°F) to 273°C (523°F)
Hardware 316 stainless steel

Other
Useful Temperature Rating -40°C (-40°F) to 200°C (392°F)
Water and Dust Ingress IP65 / NEMA 4: closed and when in use

Model Body Diameter Window Diameter Assembly Thickness
VPT-50 9.1 cm (3.6 in) 5.1 cm (2.0 in) 2.6 cm (1.0 in)
VPT-75 12.1 cm (4.8 in) 7.6 cm (3.0 in) 2.6 cm (1.0 in)
VPT-100 15.1 cm (5.95 in) 10.2 cm (4.0 in) 2.6 cm (1.0 in)