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CNC Machined from 6061-T6 Aluminum In the USA! by Americans!
All other components are polished Stainless Steel and modern O'ring seals. Shipped Ready for Installation.

These Non Vented Caps Seal Completely. Some applications may require a separate vent for proper function

Technical Information

Original Full size cap is 4 1/2 Inches in Diameter at the Flange, with a full 3 Inch Opening.
The 8 mounting holes in Flange are .210" diameter, Ideal for 10-32 hardware.

Small Cap is 2 1/4 Inches OD at the flange with a 1 1/2" opening.
The 8 mounting holes in the Flange are .109" diameter for 3-48 hardware.

These sharp looking 1/2 scale caps are ideal for Oil Tanks, Surge Tanks, and smaller Fuel Tanks.



Original size Large Caps -- $300 with Free Shipping to USA.
1/2 Scale Caps -- $200 with Free Shipping to USA.

Buy a Set of 1 large and 1 small caps -- $450 with Free Shipping to USA.


To Order Caps: Email -- Hugh Coltharp at