This hydraulic reusable fitting meets 100R2-AT specifications. For use on 2-wire 100R2-AT hydraulic hose only including but not limited to Parker 301/302, Weatherhead H425 and Aeroquip FC212, Semperit 2SN. Your hydraulic Hose OD should be .593. This kit has 1 Female JIC 1/4", threads are 7/16"x 20 And 1 Male JIC 1/4" threads, this kit will connect 1 hoses.( 100R2AT 1/4") Only. When using Field attachment fittings great for small hose breaks, when you need a quick fix. This fitting will work long term, but are designed to get you through the time until you get your hydraulic hose fix.