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#202783 - 08/27/11 02:27 PM Water Line Switch
Webmaster Offline


Registered: 10/07/00
Posts: 3149
Loc: NY, USA
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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#202786 - 08/27/11 02:40 PM Re: Water Line Switch [Re: Webmaster]
wire_twister Offline

Registered: 07/25/07
Posts: 265
Loc: Georgia USA
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

#202791 - 08/27/11 04:23 PM Re: Water Line Switch [Re: wire_twister]
sparky Offline

Registered: 10/18/00
Posts: 5545
10-4 WT, looks like a pressure cutout to me

#203046 - 09/06/11 09:08 AM Re: Water Line Switch [Re: Webmaster]
beal73 Offline
New Member

Registered: 09/02/11
Posts: 1
Loc: PA
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.

#204670 - 12/28/11 08:03 PM Re: Water Line Switch [Re: Webmaster]
SparksNmore Offline

Registered: 05/31/05
Posts: 16
Loc: KC KS
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.

#205849 - 04/11/12 01:08 AM Re: Water Line Switch [Re: Webmaster]
paul_deelen Offline
New Member

Registered: 04/10/12
Posts: 2
Loc: netherlands
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

#211193 - 09/24/13 01:29 AM Re: Water Line Switch [Re: Webmaster]
MarkC10 Offline

Registered: 09/22/13
Posts: 43
Loc: CA, Inland Empire
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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