Advice on the copper fittings replacement

[lk777]

Hello,

A DIY guy here.

I am attaching some pictures of the kitchen and bathroom under sinks plumbing.


Kitchen Sink - Pic 1 (the Main shut off valve and the cold water shut off valve)

Kitchen Sink - Pic 2 (hot water - sink and dish washer)

Vanity Sink -Pic 3 (cold,hot and hose bibb supply lines)

My question:

I am planning to replace all 1/2" - 3/8" valves (sweat installation). Is it necessary or advisable to replace all copper fittings?

Thanks.

 

[Sylvan]

If you're replacing all the valves, it is better to replace as much tubing and fittings as possible.

 

[Sponsor]

 

[Sylvan]

If the existing copper fittings are in good condition, it’s not necessary to replace them. You can sweat the new 1/2"–3/8" valves onto the existing pipes. Replace only any fittings that show corrosion, damage, or leaks.

If the existing system had an acid flux, then the fittings may corrode after a few years.
For peace of mind, I think replacing fittings for less than $16 is well worth the effort.

Additionally, the existing may have a lead type of solder, which should also be replaced.