Mansfield by Prier M-123-5035 300 Series 12" 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…

“Thank you the faucet works perfectly. When i spoke to American Valve they told me "no one makes a replacement stem". Good customer service.!!! Thanks again ”

-Joe B.

08/01/2024

$47.87

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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Mansfield Stem Assembly for 12″ Series 300 Hydrant

M-123-5035

The stem assembly has an overall length of 15 7/8 inches.
It is specifically designed for an 12-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: 670210370165

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…

“Just before an event, we had a 9 7/8" round drain cover snap in half. It was an odd size and Noel's was the only place that seemed to have one that would fit. We couldn't leave the hole exposed during the event, and Noel's was kind enough to make sure it was overnighted to us. Their effort was truly appreciated and the cover fit perfectly! I highly recommend them! ”

-Linda C.

03/27/2026