The pressure, flow rate and power characteristics of disks type electromagnetic induction pump on rotating permanent magnets (PMP) have been measured on In-Ga-Sn loop for different gaps between magnetic disks. Gained experimental data base is very important for design and evaluation of parameters of disk type PMP as theoretical calculations of parameters of such type of PMP is very difficult task due to non-uniform distribution of magnetic field and, consequently, of induced electromagnetic forces in radial direction. Along the radial direction also other important governing parameters defining the efficiency of pump (such as pole pith length and velocity of generated alternating traveling magnetic field) have non-uniform distribution. Magnetic field distribution between poles for different gaps between magnetic discs was measured. From experimentally measured pressure, flow rate and power characteristics (heat losses in liquid metal layer in the channel of pump and in electrically conducting walls of the channel of pump made from stainless steel) the averaged value of effective magnetic field was determined, which is the main parameter defining the efficiency of pump used at first order evaluation of PMP parameters. The results of measured efficiency of the pump depending on the distance between magnetic discs are very important at practice allowing to choose the gap between discs (which can be varied) to ensure needed protection of permanent magnets from heat radiation depending on the operating temperature of liquid metal in the channel of pump.