1.1kV Cold Applied Rayvolve Roll-on Joint. Rayvolve RVS jointing is the “roll-on” way to insulate and seal cable connections up to 1.1kV. The gripping force, of a specially formulated EPDM elastomer, combined with high-performance sealant forms a reliable and water-resistant insulating sleeve. The product is UL listed and CSA certified for direct burial applications.