PSL UNF 21/D...-2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/UNF 2 -A 2 L 16/16/EA/U Proportional Spool Valves