Parker - 9/16-18 x 3/8 Male Male Straight Thread O-Ring x Male NPTF 11/16" Hex Industrial Pipe Adapter - 72519184 - MSC Industrial Supply
9/16-18 Male x 3/8-24 Female Inverted Flare - Hi-Line Inc.
Parker - 9/16-18 Male 3/8 Female Male Straight Thread O-Ring x Female NPTF 7/8" Hex Industrial Pipe Adapter - 66435306 - MSC Industrial Supply
Steel Brake Line Adapter, 3/16 x 8 (3/8-24 Inverted)(9/16-18 Inverted) - AGS Company
male/male 9/16" to 3/8" adapter
Earls Hardline 3/16 for Female Flare Inverted 3/8-24 to Male Flare Inverted 9/16-18 Adapter, Fittings,Hose, Lines & Fittings up to 60% discount - www.klevering.com
3/8" Male NPT x 9/16" Female JIC, Straight Hydraulic Hose Adapter
Kiowa Ltd. - 3/8 BSP x 9/16 UNF Male Male Hydraulic Adaptor c/w O-Ring - | Kiowa Ltd | Industrial Components Online Store