The CMCP803 Explosion Proof Conduit Head is designed to be used with the CMCP4190 Eddy probe Adapter and is available in both 1/2" and 3/4" NPT versions. It is furnished with a 2" Dome lid with "O" ring seal. The CMCP803 is suitable for Class I, Div. 1 and 2, if installed in compliance with NEC 501-4(a)(b) and for Class II, Div. 1 and 2, if in compliance with NEC, 502-4(a)(b).