Billet Stainless Steel Engine Dipstick Suit GM LS Series (Fits tube headers only)These dipstick assemblies have a unique sleek design, as well as many funtional benifits: All dipstick hardware is CNC machined from billet stainless steel. Fittings, stick and hose are all stainless steel so they will stay bright & rust free even with use in an everyday driver. They provide very effectient seal for race cars running an internal vacumn pump or vac u pan system. They use an o ring sealed top to positively seal against water and dirt.