Koolance RP-401X2 Single 5.25in Reservoir for 1-2 PMP-400 Pumps, Rev.1.1 Easily combine Koolance's compact high pressure pumps into dual or serial/redundant loops! RP-401X2 is a single 5.25" bay reservoir designed for one or two Koolance PMP-400 pumps (not included). Using a convenient bottom plug, the front reservoirs can be separated or combined without disassembling the unit. Top fill ports are available for each reservoir. Machined from a solid piece of acetal for maximum reliability, the RP-401X2 has a thick acrylic window, front aluminum bezel, and stainless steel bottom covers. Two sets of G 1/4 BSPP (parallel) thread inlet and outlets appear on the back, designated "P1" and "P2" for each pump.