Listing is for 1 EK DDC 4.2 PWM pump with reservoir and bitspower heatsink. I have 2 total units available. These were used in 3U server racks that housed fully watercooled Video production systems. The units have been cleaned and leak tested. They do show signs of wear such as scuffs scrapes and discoloration. Surface level cracking due to age and does not compromise the integrity of the reservoir. Discoloration in the screw threads is cosmetic only. These pumps function perfectly and run extremely quiet once they have been bled properly. These come with the original EK pump housings and screws.