NOS now offers Super Hi-Flo bottle valve assemblies with siphon tube and nitrous 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" nitrous gauge with easy-to-see color graduations and a white pointer. These gauges have a stainless steel case with brass internals.