PVC coated reducing couplings are used to connect two pieces of conduit of different size. All REC meet Class I, Division 1 & 2, Groups C, D. REs & PLGs meet the above standards only when used in conjunction with hazardous location fittings.
Standard:
UL Standard 886;CSA Standard: C22.2 No.18;National Electric Code/CEC Class I, Division 1 & 2, Groups A, B, C, D Class II, Groups E, F, G Class III