Pex Inlet Adapter Included with Frost Proof Sillcock

Old 01-16-18, 10:01 AM
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Location: Northern Virginia
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Pex Inlet Adapter Included with Frost Proof Sillcock

The frost proof sillcock I just purchased includes a "PEX inlet adapter". I'm assuming I won't need this since I'm using copper pipe, but am curious what this would be used for and where would it be installed if I were to ever switch to PEX pipe. It is a barbed brass fitting with seal on one side. This is the sillcock:

On a related note, is the cap on the anti-siphon portion of the sillcock supposed to be tightened all the way? Is the only reason for loosening and removing the cap to replace the cartridge? How would one know if the cartridge needed replacing?
Old 01-16-18, 10:06 AM
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Can you post a picture of the adapter. Sounds like a DIY way to connect PEX to a threaded fitting (similar to a Sharkbite?). Any instructions provided with the sillcock?
Old 01-18-18, 05:10 PM
Join Date: Jun 2015
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If you haven't installed this yet, and if funds allow, I would recommend returning that sillcock and getting one made by Woodford, either Model 17 if you can remember to not leave a hose connected, or Model 19 if you want to be able to leave a hose connected over the winter. A little more expensive, but Woodford is the quality standard.

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