NRVH 19S 7/8"ld non-return valve — Danfoss, OEM manufacturer part number 0201066. Verified technical data: Product description = NRVH 19S. Applications: commercial and industrial refrigeration, marine reefer plant, cold storage installations, and secondary-loop cooling. Danfoss is a leading manufacturer in this segment; the 0201066 sits within the Danfoss refrigeration components range.