These do not work with the nylaflow tubing for 3/16 size. There is no tubing insert so theres nothing for the sleeve and nut to compress onto. If you installed these as-in, your tubing will collapse and leak. None of the SAE fittings in 3/16 size have inserts, not just these male elbows. This makes them all unusable. Interestingly the 1/4 size fittings have the inserts and work just fine. I came back to Aircraft Spruce to see if they just forgot to include the inserts, but was told inserts are not supplied with the fittings from their supplier. Pretty frustrating.
