Below is the link to the replacement stem. https://www.etundra.com/commercial-plumbing-supplies/pre-rinse-parts/repair-kits/krowne-21-302l-button-valve-assembly-ab1953-compliant/
Yes the Krowne 21-129L is interchangeable with T&S Brass units.
Hi bud, thanks for reaching out to Tundra Restaurant Supply with your question. Unfortunately, Krowne was not able to give me an exact line size for the 21-129L Pre-Rinse Spray Valve, but we did have a few in our warehouse so I took some measurements. The inlet opening (inside measurement) is 1/2", and the outside dimension of the attachment threads measures just over 3/4". Krowne did inform me that their spray valves are interchangeable and can be used with T & S Brass, Fisher, and Encore hoses, as well as any of their own Krowne hoses. Although, if you have a Fisher brand hose you'll need to order a Krowne adapter unit to use this spray valve. I hope this helps answer your question, but if you'd like a little more clarification, or help finding the appropriate spray valve for you pre-rinse hose, please give a member of our team a call at 1-888-388-6372. We'd be more than happy to find your hose model # and track down the right spray valve for you.