Bulkhead Type No. : LLB 61…Series Description Ex d Gas Gr. IIA/IIB/IIC LED Bulkhead Fitting (SMD). Rating : 30W/35W/45W/60W/72W Type No. : LB 31…Series Description Ex d Gas Gr. IIA/IIB LED Bulkhead Fitting (COB). Rating : 20W/30W/35W/45W