Mat seal cover of waterproof connector

A mat seal cover of a waterproof connector, wherein the mat seal cover is configured to be attached to a connector housing through a mat seal, the mat seal cover comprising:

• a cover body having a plurality of through holes that correspond to terminal insertion holes of the mat seal corresponding to terminal reception portions of the connector housing;
• waterproof pins provided inside the through holes of the cover body and configured to close the terminal insertion holes of the mat seal, the waterproof pins terminate inside the through holes at rear ends, and the rear ends include abutment surfaces located inside the through holes;
• and
• breakable pin retention portions provided within the through holes and between the waterproof pins and inner circumferential walls of the through holes of the cover body so as to bridge gaps therebetween,
• wherein the waterproof pins are retained in the through holes by the pin retention portions and the waterproof pins corresponding to the terminal reception portions located in use positions are configured to be punched and removed when the pin retention portions are broken by a punching jig pushed in from a rear of the mat seal cover in a pushing direction;
• and
• wherein coupling portions that are arranged between the pin retention portions and the inner circumferential walls of the through holes and that couple the pin retention portions with the inner circumferential walls of the through holes are disposed more closely to a front side in the pushing direction of the punching jig than the abutment surfaces at the rear ends of the waterproof pins against which the punching jig abuts, the pin retention portions include rear end faces located inside the through holes, the rear end faces of the pin retention portions are inclined faces extending from the abutment surfaces toward the coupling portions, and the rear end faces are inclined to the front in the pushing direction of the punching jig.