Here is one of several wiggins on a water cooled Continental
Voyager aircraft engine. This engine is also used in the new
Extra 400 high wing, cross country airplane.

Excerpt from their technical paper on the engine using wiggins couplings:

"The coolant tank provides additional coolant storage, 
coolant/air separation capability, system pressure control, coolant 
level monitoring, and supply of bleed coolant to the pump inlet. 
The coolant radiator is an aluminum plate and fin type unit with 
headers welded on each end. The coolant passage cross section is 
approximately 1.5 x 2 mm, with a length of 585 mm. Except for 
flexible lines at the engine to airframe connection points, all 
coolant is routed through components of aluminum alloy material 
with >>>> O-ring seals at each joint <<<<."

Paul Lamar
 
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