The Forney 75325 Industrial Milton style 5-piece 1/4-inch plugs and coupler value pack is steel construction. Forney airline accessories are intended for use on compressed air lines only. Forney Industries is one of Americas 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 youve got metal working questions, weve got answers. Were committed to your success regardless of location size or needs. Industrial Milton style 5-piece includes (3) 1/4-inch (6.35mm) male plugs and (1) 1/4-inch (6.35mm) female plug and (1) 1/4-inch (6.35mm) female coupler Value Pack. Max working pressure is 300 PSI. 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.