B & K Proline 888-557 10" Frost Free Sillcock Stem

Bright brass stem with brass screw black rubber washers stainless spring and metal washers.

WHAT OUR CUSTOMERS SAY…

“I texted him a picture of the shower part from the 50’s I needed and he was able to identify it immediately. I ordered it and it showed up in two days! Very knowledgeable and friendly! ”

-Jim F.

02/04/2026

$24.87

The Mueller 888-557 is a ProLine replacement stem assembly for a 10-inch anti-siphon frost-free sillcock (outdoor faucet).

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.

SKU: 21557 Category: Hydrant Hose Faucet Parts Tag: B & K Products

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B & K Products Frost Free Sillcock Stem

888-557

This is a replacement stem assembly used to control water flow in the anti-siphon frost-free sillcocks (also known as outdoor hydrants, hose bibbs, or spigots).
It is an integral part of the valve body, designed to provide key internal flow control and prevent back siphoning.
For 10″ faucet
Stem measures 13 1/2″ to 14″

UPC: 032888148598

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 thank you for your incredible service! I ordered Sterling Chrome Plate Handles on Monday late afternoon and they arrived today, Thursday early afternoon. They are exactly what we needed and are now installed and working perfectly. You are the BEST!!! ”

-Margaret Z.

10/20/2022