Moen shower/tub faucet

Question edited for correct spelling of maker 'Noen' to 'Moen'.

'Fix' as in it is leaking? Or tighten it down because it is wobbly, or something completely different?

Moen One-handle Replacement Cartridge -- 1225

MOEN https://www.moen.com > products > Moen > 1225 From finishes that are guaranteed to last a lifetime, to faucets that perfectly balance your water pressure, Moen sets the standard for exceptional beauty ...
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M-Line Moen cartridge -- M1225

Moen https://www.moen.ca > products > M-Line > M1225 Moen Cartridge · Designed for 1 Handle lavatory, kitchen and tub/shower faucets (after 1959) · Replaces O.E.M. 1225 · Backed by MOEN's limited lifetime warranty.

MOEN #1225 Single-Handle Faucet Cartridge

Home Depot https://www.homedepot.ca > ... > Faucet Cartridges
It maintains a balanced pressure of hot and cold water. This cartridge assembly is ideal for Delta Monitor 1300 and 1400 series tubs and showers. See less ...
In stock

Moen 1225 One-Handle Kitchen and Bathroom Faucet ...

Amazon.ca https://www.amazon.ca > Moen-1225-One-Handle-Repl...
Replacement faucet single control cartridge; Fits all single-handle kitchen, lavatory, tub, and shower Moen and Stanadyne faucets; Eliminates hard pull ...
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Call Moen directly. They will ship what you need to your door, for free.

The old MOEN single handle faucets like youve described usualy took a 1200 or 1225 cartridge. Both are available at most of your big home improvement stores. The answer to your question is yes MOEN parts are still avail. Hope this helps. If this advise is helpful, please give me a vote.

It needs a new cartridge. Moen gaurantees most of their products for life, so if you have the original instructions check for contact info. They'll send you a new cartridge for $0.00

Single or dual lever? A new ball if single lever. Home Depot or Menards will carry them. Teflon tape if dual cartridge. Stay away from moving parts

the cartridge if defective,replace it and your leak will stop.

Try replacing the cartridge first.That's your best bit . Next would be the whole valve. Hopefully, it's just the cartridge.

Single handle shower controls always have some water trapped inside. It has probably freeze damaged the cartridge

The plumber soldered in the faucet without removing the cartridge, the o-rings are melted. Have the builder replace the o-rings.

take out the cartridge from the fixture and make sure it has all of the "O" rings and stoppers.
look at the instruction again, make sue you are installing it the right side up. if all that, the shower still leak, then you need to talk to the place you brought the fixture, it may have a defective cartridge.