Pacific w1 cpu water block the w1 cpu water block is constructed with a copper base and anti corrosive nickel plating to provide exceptional heat transfer and cooling performance fits all modern cpu sockets pacific pr15 d5 reservoirpump combo the pr15 d5 includes a 200ml reservoir and d5 pump to provide the perfect combination for proper water cooling circulation and capacity manufactured from high quality pom and pmma material tt lcs certified tt lcs certified is the hallmark that