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Question:

What is the difference between English and Metric pipe sizes?

Designing equipment for shipment to China and they request metric pipe sizes. Where can you get metric pipe and fittings in the US?

Answer:

The absolute best method for installing pex: Hire a plumber and help out us tradesmen during a time of need. :)
If you mean claim vs the town, maybe. Some of those bumps may have been unlawfully installed. A town near me unlawfully erected about 100 stop signs. Lota people got their violations voided. I see some commercial parking lots removing them, prob same reason. Call some lawyers about it.
First, it's dry cold, so it is easier to survive than 'wet cold'. Warm clothes, hats and shoes, mittens, sometimes vodka. Apartments have central heating.
I would go with the barbed/crimped sleeve connection system rather than the SharkBite (which is a glorified Swagelock type system normally used for tubing applications). My experience with Swagelock is that they work well when installed correctly, but can be very finicky to get leak-free (tubing has to seat all the way into the fitting; ferrule must fit squarely on the tubing; must thread the nut on correctly the first time and then neither over- nor under-tighten). Also, while a Swagelock fitting body and nut are reusable, the ferrule is a throw-away item you must replace. Though I've not used SharkBite, I have the same concerns since the design looks the same. The barb/crimp looks simpler/easier to get right. In either case, the most reliable method for installation is to have only dedicated runs and to NOT install any fittings in walls (for example, don't tee off of a line in a wall to feed two sinks). Every mechanical connection is a potential leak spot. The beauty of PEX is that you can run continuous lengths from source to destination, gently bending it as needed. You can't do this with iron, copper or rigid plastic. I've seen photos of PEX installations with loads of couplings and elbows in the wallsthis is lousy workmanship that destroys a lot of the inherent advantages of PEX. As the first responder noted, follow the manufacturer's instructions/recommendations wherever possible. Plumbing errors can lead to very costly damage, and most manufacturers are interested in making sure your use of their products is a successful one. Good luck.

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