Description This stainless steel breather tube was designed to replace the often corroded or damaged sterling silver breather tubes found in Parker 51 Aerometric pens. These have been remanufactured to original brand specifications including the vent hole. These breather tubes are for the Demi sized Parker 51 fountain pens. We offer Free Shipping on all orders over $59 for US customers, and for orders over $250 for our Canadian customers.