1/4" Inverted Flare to 4AN Male to Male, 1/4" inverted flare to 4AN male to male fitting. Unrestricted version of the ATP-OIL-021. Does not have .035" restrictor. Appropriate for non-ball bearing T25/T28 turbo use. CAn also be used on GT25R, GT28R, GT28RS, GT30, and GT35R where not restrictor is needed.