Water pump bearings are used primarily in automotive water pumps and basically consist of standard double row bearings.
Mainly exist two types design;
1) Ball-ball: with two rows of balls; WIB, BWF, WS, WK, 885000
    series, etc.
2) Ball-roller: with one row of balls, one row of rollers; WIR,
    WN, WKH, 665000 series,etc.