Pioneer X-4400005 Pressure Balance Spool

Stainless spool body with bright brass threaded top with black rubber o-rings and stainless internal piston.

Pioneer X-4400005 Pressure Balance Spool - Image 3

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

$44.27

The Pioneer X-4400005 is a pressure balance spool used as a replacement part for single-handle tub and shower valves. It is designed to maintain steady water temperature and prevent sudden fluctuations (scald protection) during use.

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: 20512 Categories: Cartridges & Stems, Single Handle Faucet Cartridges Tag: Pioneer Faucet

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Restore your shower’s safety with the Pioneer X-4400005. This crucial internal spool, measuring 2 3/8 inches in length, balances hot and cold water pressure to prevent dangerous temperature spikes and scalding in single-handle shower systems.

X-4400005

It acts as a balancing mechanism within the valve to ensure safety and user comfort by stabilizing water temperature.
Fits 4010B 1910B & 4011B series valves
2 3/8″ length

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…

“These people were extremely helpful in taking me through replacing a 25 year old hard water frozen cartridge on my Philrich sink faucet. They were able to identify the correct part I needed from a photo I sent (I had it figured out wrong). I was pleasantly surprised they had an obscure part like this, but they also told me how to extract the old one when I couldn’t get it out. They said to unscrew it after I had concluded from YouTube the old cartridge was supposed to just slide out. It threaded out as they said and saved me buying a cartridge extractor and a hernia. The whole experience has been excellent. ”

-Pete L.

03/10/2026