Question: Based on sealing requirements, is this installation compliant - why or why not? All seams of a Category 2 Hardened Carrier are sealed using a thick transparent epoxy seal. No couplers or set-screws are used in sealing it. Question Select one: a. No, epoxy seals must use a thick opaque material. b. No, Category 2 Hardened Carriers should only be permanently sealed via welding. c. Yes, no couplers are set-screws were used in sealing it. d. Yes, the carrier was permanently sealed via a thick transparent epoxy.