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    edwack's Avatar
    edwack Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 12, 2007, 07:36 AM
    Replacing a steam boiler site glass
    How do you replace a steam boiler site glass that cannot be seen through.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 12, 2007, 11:27 AM
    Buy the glass. Use a special inside glass cutter to cut the glass to the proper length. Replace glass with new rubber gaskets. You are done.
    Heating and Cooling Man's Avatar
    Heating and Cooling Man Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 7, 2008, 08:24 PM
    You can buy a sight glass from a wholesale house or heating contractor. Remove the old glass by loosening the nuts on either end of the sight glass. There are rubber gaskets under those nuts. Along the lines of a compression gasket. Get new gaskets when you get the sight glass. Put the nuts and washers on the new glass and install and tighten the nuts.
    Do not overtighten
    ivanh's Avatar
    ivanh Posts: 52, Reputation: 3
    Junior Member
    		  
    #4

    Nov 6, 2010, 03:07 PM
    Comment on hvac1000's post
    I never tried this but wouldn't a nice soaking in CLR overnight clear the old glass. Worth a try?
    Just thinking out loud.
    pachai's Avatar
    pachai Posts: 2, Reputation: 1
    New Member
    		  
    #5

    Dec 5, 2011, 08:23 PM
    You can clean the boiler sight glass without removing it.
    I googled clean boiler sight glass ammonia after I broke one.
    Note - I am not a plumber, but this worked for me...

    http://www.superiorspecialty.com/Main/Heating/Topog-e/maint.html
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