Wagner 0515902 High Pressure Power Roller Attachment, Plastic & Polyester FiberRoller arm attachment for piston pump sprayers. Push button supply for fast, even coverage of large, interior surfaces. Paint is distributed from the paint can through a hose to the roller cover. Cover Material: plastic and polyester fiber Paint roller attachment for wagner power sprayers Push button supply for fast, even coverage of large, interior surfaces Paint is distributed from the paint can through a hose to the roller cover