2.25
EATON AHCL620C ARROW HART LOCKING CONNECTOR, NEMA L6-20C, 20A, 250V, 2P, 3W
You will find Eaton units are a common sight in electrical panels.
Ruland Fcr24-12-6-A Coupling, 6 Beam Clamp, Bore 3/4 X 3/8 In
What stands out about this air filter is the simple maintenance routine it requires.