Does not come with two tube fittings (inlet and outlet), probably because users use different diameter tubes and the fittings can be bent or straight. Buy what you need at a hardware store or online. My fittings are for ¼" OD tubing, with the outlet tubing going to a potable water faucet (also branches downstream to connect to a refrigerator icemaker). But you can have ⅜" OD tubing, or even larger The threaded end of these fittings should be ⅜" NPT, this end will thread into the top of this filter mounting bushing.
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