The Forney 87809 Tank to Acetylene Regulator Adaptor is used to convert a CGA-510 No. 4 145 cubic feet (CF) acetylene tank to a CGA-300 acetylene regulator. This adaptor is solid brass. 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. 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.