RPE have been able to produce coils that are compliant with the UL regulations for some time, but the customers still had to do a lot of work with the UL approvals inspector to clear the valve for use in UL approved equipment. As the regulations have recently been tightened up this route has been made even more difficult. Knowing that their valves are used in products and applications worldwide and with the rise in the North American market RPE have expanded their range of UL listed valves so that most of the R and R-Mini series are now covered. These valves now includes: Type R –Single, Type R –Double, Type R – Triple, Series R Mini, Series RM Modular and Model R Dual 257.