Description Teflon thin-wall tubing can be used as a breather tube in many Parker Vacumatic, 51 Vacumatic, Eversharp Skyline and other pens in which a flexible breather tube is needed. The 3 inch piece is suitable for most applications and may need to be tapered or hand fit, depending on the pen. For best results, cut with a sharp razor blade or scissors and adjust as needed. Feeder holes may need to be drilled to size if too small, or shellac added if too large. This is not intended for use in Parker 51 Aerometric pens, where the stainless tube is required. We offer Free Shipping on all orders over $50 for US customers, and for orders over $250 for our Canadian customers.