... are the same, heat and cold, mark, main is to distinguish which is hot water, which is cold water. ... that the triangle valve shut it off, don't have to shut the home always valve. (4) is beautiful ... press in 10 years of above, the FanSha 5 to 8 years of alloy 3 years or so. Alloy ... will be very brittle, might break to the pipeline and can't be replaced, copper is easier to change.How to calculate the ...