Package Included: 2 pcs M10 4AN to 4AN Male Flare Coupling Union Adapter

Size: AN4-M10x1.0

can use to splice or extend a line, works with female thread fitting.

Black 6061-T6 aluminum 4AN flare union work 

temperature: -65 to +252 degree F, 

max pressure: 1000 psi, 

ultimate torque: 17N.

Male to male flares coupler usually used in fuel system,such as fuel hose extend, line connect to fuel filter, fuel pump, cooler system.

Please match the correct size.