Its the water quality that gets you, around here they last forever.

Also I find the best place to get plumbing parts is from plumbing supply houses. The stuff you get at the big box stores while it may have the same name on the box is often made a bit cheaper.

__________________
2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200