... the same, heat and cold, mark, main is to distinguish which is hot water, which is cold water ... the triangle valve shut it off, don't have to shut the home always valve. (4) is beautiful ... only 90 degrees can fix, commonly known as the open type.Triangle valve use fixed number of yearRed rushed ... and can't be replaced, copper is easier to change.How to calculate the triangle valve usageThe toilet one, the ...