NOS now offers Super Hi-Flo bottle valve assemblies with siphon tube and NOS pressure gauge already installed. This gives you a great way to upgrade to the highest flowing valve and tube NOS has to offer. Key bottle valve features include a 1/8"NPT gauge port, 1/4"NPT accessory port, large internal and outlet ports, along with an O-ring seal. Our 3/8" id screw-on siphon tube is made from 6061 aluminum can be used as an upgrade for an older style compression fitting tube. Lastly, included with our assemblies is either blue or black face 1-1/2" NOS gauge with easy-to-see color graduations and a white pointer. These gauges have a stainless steel case with brass internals.;Super Hi-Flow assembly features siphon tube and NOS pressure gauge already installed; Great way to update a bottle to the best flowing valve NOS offers; Valve has large internal ports for superior flow and an O-ring bottle seal; Siphon tube is made from 6061 aluminum and 3/8” I.D. for maximum flow; 1-1/2” diameter NOS pressure gauge features stainless steel and brass construction providing accurate pressure measurement; Assembly is designed to Support 500+ Horsepower;