frostguard 4m 40W 230V selvreg — Danfoss, OEM manufacturer part number 1035019. Verified technical data: Product description = slph-10, 4m, pipeheat plug in 40W. Applications: commercial and industrial refrigeration, marine reefer plant, cold storage installations, and secondary-loop cooling. Danfoss is a leading manufacturer in this segment; the 1035019 sits within the Danfoss refrigeration components range.