HAWK Products:

Description	Part Number
HAWK CONNECTOR 3/4 INCH NPT	501/421/B/075NPT
1/2 NPT EXPLOSION PROOF HAWK CONNECTORS	710-0-0S-1/2NPT
HAWK XPROOF CONNECTORS	753 ARE 3/4 NPT
1/2NPT EXP PROOF HAWK CONNECTOR	HG-753A-050NPT