Is A 3/4" Sillcock Really 3/4" Inner? - Plumbing - DIY Home Improvement | DIYChatroom
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Old 06-18-2015, 04:48 PM   #1
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Is a 3/4" sillcock really 3/4" inner?


Hi, I have a 1/2" non-freeze sillcock that I installed myself a couple of years ago. The other day it dawned on me that if I replaced it, along with the six feet of 1/2" copper that feeds it with 3/4" I'd get better flow from the 1" garden hose. Even my small hoses are 5/8".

HD didn't have any 3/4" sillcocks ... just combinations that play games with inner/outer threads to support both hookups.

Does anyone know if the typical 3/4" sillcock will give me better flow than a 1/2", or are they both the same sized plumbing inside?

Thank you.
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Old 06-18-2015, 05:53 PM   #2
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Look into the hose attachment. The point of greatest restriction is often (but not always) the hole where the water exits the valve body into the hose.

Here is a pic. See the smaller hole that is set back inside the hose casting. With the same size supply pipe, the larger this hole is generally indicates the better the flow.
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Old 06-18-2015, 06:16 PM   #3
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Thanks. They don't carry these at the box stores though, so I'm unable to measure them. Need to verify before ordering somehow...
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Old 06-18-2015, 06:45 PM   #4
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I don't think you'll find any difference until you upgrade to a high end industrial/commercial model- and it will probably cost you dearly....
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