Reddit reviews M1.5x11 Viton O-Ring, 75A Shore Durometer, Round, Black, 11 mm ID, 14 mm OD, 1.5 mm Width (Pack of 25)
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Metric O-ring made of Viton (fluorocarbon elastomer) for use with a variety of chemicals and fuelsDurometer (hardness) of 75A for resistance to penetrationRound cross-section provides a seal between cylindrical overlapping surfacesFor use across a wide temperature range from -15 degrees F/-26 degrees C to 400 degrees F/205 degrees CMeets standards defined by Aerospace Standard AS568A
Try something like these one or two should stack the thread protector high enough to cover the threads and the O-ring help keep it on tight