Abstract: A two-way filter bypass valve seat has several holes, in this case four. Two similar valve plates with two holes each are arranged at 90.degree. to each other on opposite sides of the seat so that two holes in each plate align with two of the holes in the seat. A single spring or a spring for each pin is compressed by a keeper which joins the rivets or individual keepers on ends of the rivets in the case of individual springs. The large single keeper is square; rivets extend through opposite corners of the square and remaining corners are bent inward to retain a large spring from lateral displacement. The seat is mounted in a conventional cartridge-type oil filter with a two-way valve across the central screen cylinder so that excessive pressure differential from either side of the valve opens the valve to permit flow, bypassing the filter. The seat extends across the inner screen cylinder to seal the inner cylinder permitting flow only through the valve.