Redhorse Performance -4AN Straight Female Aluminum Hose End - Black - 1000-04-2 Lug Nuts with Locks Countersunk - the threads inside

Countersunk - the threads inside of this knob extended all the way to the center

AI3-XTG6 kit features an Xtreme pressure plate for the most demanding driver

the coolant ports on all Hybrid Racing K swap radiators are relocated to allow the use of shorter coolant hoses when used in conjunction with a K series motor

Hoses are SAE20R4# compliant

Bad news: your OEM bushings suck

Redhorse Performance -4AN Straight Female Aluminum Hose End - Black - 1000-04-2 Lug Nuts with Locks Countersunk - the threads insideRHP swivel seal AN hose ends are meticulously engineered. We start with detailed CAD drawings and then cut each component from 6061 T6 Aluminum on our CNC machine turning centers providing superior thread strength and smooth assembly. RHP's custom designed hose nipples enable a quick, easy and consistent hose end assembly and our double swivel seal design makes for easy re clocking. Our double viton O Ring seals provide leak free performance when used