We have 3 Moen pull on, push off, twist to adjust temperature shower controls. Is it possible to retrofit "no scald" valves in these shower controls?
I highly doubt it. But Moen does have an excellent customer service 800 number
Can not be done.
...And the reason is: they have different bodies, so they are not interchangeable.
To convert to no scald, you need to replace the body, inside the wall, which involves plumbing repair, drywall repair and or tile repair, painting, in addition to possible framing alterations.
May be too much for the average DIYer.