Heater Bypass Valve For RV-10

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Part# 08-06230


The all stainless steel heater bypass box was conceived while looking at aluminum hardware used for sealing the firewall on experimental aircraft. It didn't make much sense to try to seal a stainless steel firewall with aluminum hardware. It is well known in the metal working world that stainless steel melts at 2600 degrees and aluminum melts at 1200 degrees. What most pilots don't know is that windblown avgas burns about 1875 degrees. And so, work on the all stainless steel heater bypass box began.

The all stainless box withstood the torturous flames for 10 minutes without failure. A good first test. Then the aluminum box was tested. In only 16 seconds the aluminum was a liquid puddle at the bottom of the simulated firewall. Only 16 seconds, you might not even know you have an engine fire in that time. This was an eye opener.

Once the all stainless steel heater bypass box was in production, the fun part began. Testing initially was a challenge because a simulated engine fire was required. But how hot does windblown avgas really burn? Our tests showed that windblown avgas burns at 1875 degrees. Now the test bed was in place.

Three models of the all stainless steel heater bypass boxes are offered. The engine side control lever comes with a backing plate that attaches to the cabin side of the firewall and has a 2 inch scat tube outlet so a tube can be attached in the cabin that directs air where wanted.

All stainless steel construction offers a fireproof closure in case of an engine fire.

New flapper design offers better seal to keep out hot air when closed.

California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.

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High quality

Ronald A Verified Purchase


October 25, 2022

work very well

Dennis L Verified Purchase


March 18, 2022

Exactly as advertised.

John S
August 13, 2020

Bought this because its stainless steel VS aluminum on firewall. But, found design to be better too. Has a small baffle incorporated in front of flapper door so that hot air will not find its way under door when closed. It looks like a small thing that will make a big difference in unwanted heat coming into cabin.

Randy V
September 9, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is this heater bypass valve for RV-10 a two pack as pictured, or would I need to order a quantity of two?

These are priced and sold as a two pack as shown in the image. Quantity 1 will ship exactly as shown in the picture.

Q: How is this different from PN 08-01311-1?

P/N# 08-01311-1 is for the cabin side. P/N# 08-01311 is for the engine side and 08-06230 is for the firewall.

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