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Brass fittings can be used underground for water lines; always check your local code office first. They should not be used for gas lines.
Always and only solder.
Brass is commonly used for most plumbing fittings.
According to me, brass material is used in bathroom fittings. People should choose the right quality bathroom fittings in order to get long lasting durability.
For basic plumbing fittings, either copper or brass fittings is your best bet. Copper is more for just water lines, and brass is for various uses, but more expensive. Sites like DrillSpot.com are great places to start looking.
-Chromium plating is commonly used as it protects brass and copper fittings which are exposed to water from becoming covered in verdigris. - Correction- it USED to be chromium but then they found that silicon works better.
There are many companies that offer brass fittings. Among them are BrassFittings, AndersonFittings, AlaCop, ThomasNet, Elkhart Products, and ObrienBrassCompany.
Yes all brass object can be recycled.
yes
Yes, you can use brass fittings or the plastic fittings that snap onto to the plastic line. I like the snap on fittings.
Not necessary, but recommended along with pipe thread compound.