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B & K Proline 888-558 12″ Frost Free Sillcock Stem

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

chat iconWHAT OUR CUSTOMERS SAY…

“After trying all over my area, I couldn't find the part for the faucet in my older house. The part I needed was found on the first try on their website and ordering was very easy. It was after hours, but someone responded to my text right away. The part was shipped the next business day. After putting the new part in the faucet works better than it has for years! ”
-Mark B.
06/25/2026

$26.47

 

The Mueller 888-558 is a replacement stem assembly for anti-siphon, frost-free sillcock (outdoor faucet) valves.

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: 21558 Category: Tag:

B & K Products Frost Free Sillcock Stem

 

888-558

 

 

  • This product is a replacement stem assembly used to repair single-control, anti-siphon, and frost-free sillcock valves. It helps fix issues like constant dripping or a faucet that won’t shut off completely.
  • For 12″ faucet
  • Stem measures 15 1/2″ to 16″

 

UPC: 032888148604

Common questions about this product

Is this item the original manufacturer's recommended replacement part? chevron-icon

Yes, this is the OEM recommended part.

Is this the correct item for my application? chevron-icon

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.

 

 

chat iconWHAT OUR CUSTOMERS SAY…

“I sent in photos of a broken cartridge (still installed, couldn’t take it out myself due to water shut-off restrictions in a condo) and even with the limited view they were able to tell me the exact part I needed so I could have it ready for the plumber (meaning I didn’t need to pay for a plumber to come out twice!!) ”
-Alaina W.
06/27/2026
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