A camshaft phaser assembly, including: an axis of rotation; a first hydraulic camshaft phaser including a stator arranged to receive rotational torque and including a plurality of radially inwardly extending protrusions, a rotor including a plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions, and a plurality of phaser chambers, each phaser chamber circumferentially bounded by a respective radially inwardly extending protrusion included in the plurality of radially inwardly extending protrusions and a respective radially outwardly extending protrusion included in the plurality of radially outwardly extending protrusions; a second hydraulic camshaft phaser; a cap; and a fluid chamber bounded in part by the cap and in fluid communication with a phaser chamber included in the plurality of phaser chambers; and a bolt arranged to non-rotatably connect the rotor and the cap to a camshaft.