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NO but you will need some type of sealent OR braze or soldering
Coated Copper Pipe that is approved for underground only.
Type L copper
It is probably referring to the type of fitting. A fitting that is soldered to a copper pipe. It is called sweating when you use solder and a torch to connect copper pipe together or attach fittings to copper pipe.
Possibly the same reason it has a blue line in the USA to show it is compatible to type L tubing used for domestic water supply.
Copper pipe is soldered. Steel pipe is welded. Plastic pipe (pvc) is glued. There is even a type of pipe that is smoked...
No. Regardless of what type of supply line you use between the house supply and the faucet it will be a compression fitting. Copper lines with a nut and ferrule or flexible ones are both compression and do not need tape or pipe dope.
It is the THINNEST ply of copper pipe and is ONLY used for heating purposes like baseboard heating!
COPPER TUBING TYPE "L" BUT make sure it is propelr drained in the winter months if freezing is possible
Type L or Type K copper pipe is typically used for underground applications. These types of copper pipe have thicker walls than Type M copper pipe, making them more suitable for underground installation where they may be exposed to greater pressure or potential damage. Additionally, this thicker wall helps to prevent corrosion and allows for increased durability underground.
Water lines BELOW ground
You do not need tape on any flared fitting, brake or regular. The brake line and the fittings are different size and thread type than regular copper line and fittings. You can't mix them.