Comparison : Item # 1031-6564-04-04-04, Test Point 7/16"-20 Male J.I.C. x 7/16"-20 Female JIC Swivel x 7/16"-20 Female SAE O-Ring Steel MJ-FJS-FORB
Item # 1031-6564-06-06-04, Test Point 9/16"-18 Male J.I.C. x 9/16"-18 Female JIC Swivel x 7/16"-20 Female SAE O-Ring Steel MJ-FJS-FORB
Item # 1031-6564-08-08-04, Test Point 3/4"-16 Male J.I.C. x 3/4"-16 Female JIC Swivel x 7/16"-20 Female SAE O-Ring Steel MJ-FJS-FORB
Item # 1031-6564-10-10-04, Test Point 7/8"-14 Male J.I.C. x 7/8"-14 Female JIC Swivel x 7/16"-20 Female SAE O-Ring Steel MJ-FJS-FORB
Item # 1031-6564-12-12-04, Test Point 1-1/16"-12 Male J.I.C. x 1-1/16"-12 Female JIC Swivel x 7/16"-20 Female SAE O-Ring Steel MJ-FJS-FORB