NRV 06S 1/4"ld non-return valve — Danfoss, OEM manufacturer part number 0201010. Verified technical data: Product description = NRV 6s. Applications: commercial and industrial refrigeration, marine reefer plant, cold storage installations, and secondary-loop cooling. Danfoss is a leading manufacturer in this segment; the 0201010 sits within the Danfoss refrigeration components range.