The TE Connectivity 213933-1 is a rear-shell boot for the CPC (Circular Plastic Connector) series, shell size 17. It slides over the cable exit of a mated CPC connector pair and is heat-shrunk to seal the back of the connector against dust, moisture, and strain. The boot is a field-installable accessory, not a connector half — it goes on after the terminals are crimped and the insert is seated. The construction is a black nylon shell with an inner layer of polyolefin heat shrink. The nylon gives the boot its rigid outer shape and impact resistance; the polyolefin shrinks down around the cable jacket when heated, creating a weather-tight seal that keeps contaminants out of the contact cavity.
Shell size 17 — which CPC inserts it fits
Shell size 17 on the CPC series corresponds to a specific insert diameter. This boot fits any CPC connector — plug or receptacle — that uses a shell size 17 insert. It does not fit shell sizes 11, 13, 23, or any other CPC shell size. Check the insert part number or measure the connector's rear-shell diameter against the boot's inner bore before ordering.