Help fixing nitrous bottle, plz

[angel67]

Hello, I'm new & hoping this is the right place to post. I just p/u a new 15lb bottle that (we think) the siphon tube is loose inside (it rattles terribly). I'm trying to find out how to fix this-I keep finding references to this being an easy fix, but no steps on how. I just want to make sure we can get it apart as well as back together w/out causing additional problems. Any assistance would be greatly appreciated.

[91Notch]

Probably gonna need 2 people for this (one to hold the bottle, one to work the wrench) but just get a wrench and unscrew the valve off, tighten the tube, and screw the valve back on. Use some NPT paste on the threads to help seal it. Plus make shure the bottle is empty lol.