21580 Flexible Duplex Conduit Connector, 3/8 in, Zinc, 2/PK

In a dry location, use to connect two pieces of flexible metallic conduit, AC, MC or NM sheathed cable, to a steel outlet box or other metal enclosure when using only one knockout opening. Fits 1/2 in knockout. Suitable for #14-2 thru #12 to 3 wire with ground NM sheathed cable, #14 to 2 wire steel armored cable, #14 to 2 wire with ground aluminum armored cable, 3/8 in FMC, aluminum smooth sheath metal clad cable 0.410 to 0.500 in Dia, aluminum interlocked metal clad cable 0.460 to 0538 in Dia and steel interlocked metal clad cable 0.438-0.560 in Dia.