W209PPB4 Agricultural Disc Harrow Bearing - 1-1/2" Round BoreW209PPB4 Agricultural Disc Harrow Bearing 1 1 2" Round Bore Triple Lip Seals Factory Lubed The W209PPB4 is a heavy duty agricultural bearing built to stand up to the elements mud, water, dust, you name it. With a 1 1 2" round bore and a spherical outer diameter, this bearing is designed for use in disc harrows and field equipment that take a beating. It features a non relubricable design, but dont worry it comes pre greased and sealed with a one piece