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Water Line Switch #202783 08/27/11 05:27 PM
Joined: Oct 2000
Posts: 3,636
Admin Offline OP
I was installing a new electrical hookup for a disposal last week and ran across this. The supply for the old disposal was run through this and then to a snap switch inside the sink cabinet. The home was built in the 1870's and I was told the kitchen was added around 1900.

This switch was incorporated in the cold water supply line under the sink. I'm interested in what purpose this served at one time.

Thanks in advance. Jeff (electricianjeff)

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Re: Water Line Switch [Re: Admin] #202786 08/27/11 05:40 PM
Joined: Jul 2007
Posts: 265
wire_twister Offline
Just a guess, maybe to keep the disposal from operating without water running. Just my 2 cents.


Life is tough, Life is tougher when you are stupid
Re: Water Line Switch [Re: wire_twister] #202791 08/27/11 07:23 PM
Joined: Oct 2000
Posts: 5,389
sparky Offline
10-4 WT, looks like a pressure cutout to me

Re: Water Line Switch [Re: Admin] #203046 09/06/11 12:08 PM
Joined: Sep 2011
Posts: 1
beal73 Offline
New Member
My guess would be a pressure switch for a well pump. Back in the day they would have used a shallow well pump and since there would be no need for running water other than in the kitchen, the switch was under the sink.

Re: Water Line Switch [Re: Admin] #204670 12/29/11 12:03 AM
Joined: May 2005
Posts: 16
SparksNmore Offline
I wish I had a dollar for each one of those that I've removed.

When the Insinkerator was invented back in 1927, they were afraid that folks, not being accustomed to garbage disposers wouldn't remember to run cold water and wanted to be sure that it could not turn on unless there was water flow.

Re: Water Line Switch [Re: Admin] #205849 04/11/12 04:08 AM
Joined: Apr 2012
Posts: 2
paul_deelen Offline
New Member
on commercial vessels this is common looks of sensors.
well for me, yes i know the navy is better

Paul Deelen
phone +31736139136
skype to paul.deelen
Re: Water Line Switch [Re: Admin] #211193 09/24/13 04:29 AM
Joined: Sep 2013
Posts: 43
MarkC10 Offline
Good answers above .. I would tend to think it's an electrically controlled valve, why ... ? maybe it was cheaper or less maintenance than having a mechanical valve. less effort thats for sure .. now I've seen the reverse with air switches whereas the air engages a relay for the power but water doing that would be pretty weird .. unless it was to act as a type of flow switch maybe a signal light went off when water flowed .. strange but somewhat in guinness.

Anyone claiming to know everything about Electrical, is wrong.


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