This CO2 shutoff with 1/4" MPT threading and check valve is ideal for use with CO2 regulators and manifolds! It has 1/4" MPT right-hand threading on one side that threads into most standard regulators and manifolds. On the other end is standard 1/4" MFL threading, which works perfectly with standard swivel nut sets and other 1/4" MFL fittings. If using a swivel nut set, we recommend using a plastic flare fitting as well, in order to create a good seal. Get one of these to replace a damaged or missing shutoff, put on a wye splittler, or create your own CO2 apparatus!