Oil Tank Quick Drain Valve

Yes they are compatible. I have fitted numerous ofthe Aircraft Spruce ones to the 915is

Rotax doesn't like them and I don't either. They drain so slow you do not get a decent flush of the tank. It takes 10 seconds to take the regular plug out. Plus by the time it finally drains it could have done three other things.

Mine is installed with the extension kit. Since an oil change is now MUCH easier, and no mess, i still need to remove the scat tubing, but you can see how buried the tank is on my gyro installation.

I now change my oil more often which I believe decreases wear and lengthen any aircraft engine's life.

There are two different brand of quick drains on Aircraft Spruce. Which did you choose?

I used
Saf-Air Oil Drain Valve M12175 with

Rotax 912/914 Adapter For Saf-Air M12175 Drain Valve

Both from Aircraft Spruce.