Viewport Window Plugs

Our Viewport Window Plugs, including both standard and short variants, are designed to provide a clear visual window into internal components such as servicing lights or fuse locations. Manufactured from UL94V-2 rated transparent polycarbonate, they offer excellent durability and heat resistance, withstanding temperatures between -40°C (-40°F) and 115°C (239°F).

Available in round and oval styles, these plugs feature locking fingers to allow incremental fitment across a range of panel thicknesses. The shorty versions are specifically designed for thinner panels up to 1.6mm to minimise intrusion into the application.

Ideal for use as visual inspection ports or to blank off unused holes, these plugs combine strength with clarity, making them a versatile choice across many industries.

We stock sizes from 4.7mm to 50.8mm, including shorty sizes from 13mm to 25.7mm, with various options for wall thicknesses. For all available sizes, see the table below or contact our team for custom solutions or bulk pricing.

Key Product Features

• UL94V-2 rated clear polycarbonate construction

• Withstands temperatures from -40°C to 115°C

• Round and oval styles available

• Standard version: multiple locking positions for broader panel thicknesses

• Shorty version: single locking position for panels up to 1.6mm

• Allows internal visibility without removing the plug

Commonly Used For

• As viewport plugs for inspecting internal components

• As blanking plugs to close off unused panel holes

Need help with our range of Viewport Window Plugs? Give us a call on 01233 713 581

A = Mounting Hole Diameter
B = Panel Thickness
C = Head Diameter
D = Overall Height
E = Colour