This part is a kind of semiconductor called MS21921.

Function of this product has FUEL VALVES.

Manufacturers : Aviaquip

Image and pinout :

Some of the text within the PDF file :

STEEL -2 -3 -4 -5 -6 -8 -10 FLARELESS TUBE FITTINGS DASH NUMBER ALUMINIUM STAINLESS TUBE SIZE THREAD SIZE -2 D -2J 1/8 .3125-24 -3 D -3J 3/16 .3750-24 -4 D -4J 1/4 .4375-20 -5 D -5J 5/16 .5000-20 -6 D -6J 3/8 .5625-18 -8 D -8J 1/2 .7500-16 -10D -10J 5/8 .8750-14 MS21902 Union - Flareless Tube MS21902D (Aluminium) MS21902 (Steel) MS21902J (Corrosion Resistant) MS21904 MS21904D (Aluminium) MS21904 (Steel) 90 Degree Elbow Tube to Tube MS21907 MS21907D (Aluminium) MS21907 (Steel) MS21097J (Corrosion Resistant) 45 Degree Elbow Flareless Tube to Bulkhead MS21908 MS21908D (Aluminium) MS21908 (Steel) MS21908J (Corrosion Resistant) 90 Degree Elbow larless Tube to Bulkhead MS21913 MS21913D (Aluminium) MS21913 (Steel) MS21913J (Corrosion Resistant) Plug - Hex Head MS21914 MS21914 [ ... ]

MS21921 PDF Datasheet Download