Mansfield by Prier M-123-5034 300 Series 10" Stem Assembly

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Copper stem with bright brass coarse threaded end with black rubber washer brass screw metal washer and grey graphite packings.

Complete 300 series faucet picture with grey handle polished chrome body copper tube and brass end.

WHAT OUR CUSTOMERS SAY…

“Really great experience getting parts for my 30-year old frost free silcocks. They not only had the parts available, but they were shipped within a couple of hours. Great job, thank you! ”

-Phil R

02/08/2026

$46.47

This item is a complete replacement stem assembly for the “original style” 300 series Mansfield wall hydrants (manufactured between 1970 and 2013), made by Prier Products.

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, noelsplumbingsupply@fuse.net, or via the text widget on this screen.

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Whether you’re fixing a persistent leak or performing routine seasonal maintenance, this genuine replacement ensures a perfect fit for 10-inch wall depth hydrants. The assembly comes pre-equipped with necessary washers and both left- and right-hand graphite packings, making it a versatile “DIY-friendly” solution for older plumbing systems.

M-123-5034

The stem assembly has an overall length of 13 7/8 inches.
It is specifically designed for an 10-inch wall depth, measured from the back of the face plate to the water shut-off. It replaces the stem in a 378-08 or 379-08 hydrant.
The packaging includes the stem assembly, a metal O-ring, a support washer, and both left-hand (large flat) and right-hand (small thick) graphite packings to accommodate different faucet types.

Related Documents

300 Series Faucet Parts Breakdown

UPC:670210370158

Customer submitted images.

Common questions about this product

Yes, this is the OEM recommended part.

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

We will make sure you have the right part.

WHAT OUR CUSTOMERS SAY…

“I just wanted to say - you guys rock. I got my order one day after I placed it, and the part works great and let me get my guest shower back up and running. Thank you so much! ”

-Micah C.

05/31/2023