All I can say is that this is the best thing since they invented the wheel! I'm a plumber and very rarely vape pipes now! They can be a bit pricey for valves and such, but it's quick and easy and any homeowner can do most repairs themselves! If using copper tubing remove the plastic inserts with needle nose pliers, but if using plastic tubing leave them in place! I found out about these 5 years after they left the contractor at work and he exploited them for 5 years! He swore on her! It's really amazing how they work! You can turn the valves and turn the couplings after sliding them onto the pipe and not a drop of water will flow! Just unbelievable! I highly recommend it!
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