Or save yourself a lot of bucks and use 1/2 or 3/4 inch EMT steel connectors (Lowes or Home Depot) along with a 4" piece of firesleeve. These are steel fittings that are normally used in electrical metal conduit installations to adapt the EMT tubing to electrical boxes.
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Deene Ogden.
N399AD RV-12...flying
N299AD RV8 QB, IO-390X, BA prop...SOLD
N199AD One Design...SOLD
N99AD BD4, flew for 22 years...SOLD
EAA Tech Counselor/Flight Advisor
CFII, MEI, CFIG
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