The CIRBP18LBN from TE Connectivity AMP Connectors is a black circular connector backnut (18).
The CIRBP18SCHSA from TE Connectivity AMP Connectors is a black and gray heat-shrink connector backshell adapter, 1-20 UNEF-2B, for size 18.
The CIRBP18ECHSA from TE Connectivity AMP Connectors is a black heat-shrink backshell adapter, size 18, with 1-20 UNEF-2B thread.
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