Threaded or unthreaded?

Hi I know this is the part however I am not sure if it should be threaded or not? I didn't realise there would be both. Please advise, Thanks
Asked 7 years ago by Adrienne
www.showerdoc.com/bristan-brass-thermostatic-cartridge-not-threaded-cart-06734b

www.showerdoc.com/bristan-cartridge-threaded-cart-06734a

Your shower will take only one of the above. These are two different cartridges that happen to look the same , but also have different part numbers.

Answered 7 years ago by Barrie Seabright

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