EATON Weatherhead 61X3 Compression Fitting Nut, CA360 Brass, 3/16" Tube OD (Pack of 20) Compression tube fitting nut for use with compression fittings in a range of fluid transfer applications Suitable for use with 3/16" OD tubes CA360 brass for strength and resistance to corrosion Operating temperature range of -65 to +250 degrees F (-53 to +121 degrees C) Meets SAE 060110 specifications for tube fittings