The Forney 87731 Oxygen Regulator Output Connection is suitable for use with all Forney oxygen regulators and similar regulators using a 1/4" NPT output connection. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5, 000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs. This connection has a 1/4" (6. 35mm) national pipe thread (NPT) by 9/16" (14. 29mm)-18 right hand thread (B style fitting). Claims for must be made within 90 days of the date of purchase. Proof of purchase required. This does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.