The same that is used above ground. Sweat fitting coupler. I would not use copper
underground in an area that has winter.
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.
Pex, a flexible potable waterpipe is the preferred. You can use PVC that is potable and copper that has been sleeved. No joints of any kind should be used on underground portions of the piping. That is why pex is preferred as it comes in various sizes and lengths in rolls.
A flare joint is used on gas fittings and uses a nut and flare fitting to make the connection. This is a dry fit with no joint compound. The copper is soft enough that it compresses with the nut and forms the seal.
The best sealers for copper pipe are a combination of plumbers tape and plumbers epoxy. The tape is used to temporarily seal any holes while the epoxy dries.
Egyptians invented the copper pipe. They used them to build elaborate bathrooms in the pyramids. They also used them for irrigation and sewage systems. +++ Bathrooms? In the Pyramids - which were built as tombs?
Underground I use K copper exclusively..
Coated Copper Pipe that is approved for underground only.
No, it is made for water only. Black iron pipe or copper are only allowed and a special plastic coated copper for underground installations.
Get rid of the entire copper pipe and fit 3/4 PEX from the street main into the house. Cheap and reliable.
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.
I am a Plumbing/HVAC Contractor and the type of fitting I always used for underground copper service pipe has been 3/4" (standard size for residential) brass flared fittings. A flared connection is a tight, secure connection guaranteed not to leak.
I am sorry, but can you PLEASE rephrase your question? Can WHAT be used for copper pipe? When? How? Why?
it is used for plumbing
You can use copper pipe.
Copper pipe was common anywhere in US.
It is a copper pipe used in plumbing.
It is the THINNEST ply of copper pipe and is ONLY used for heating purposes like baseboard heating!