Universal heat riser valve adapters are available in two and three bolt designs, and fit 2-1/2" and 3" collectors.
 
Part # ProductDescription Media
211202 1/2” HEDDER RING MECHANICAL/VACUUM OPERATED HEAT RISER VALVE2-1/2" HEAT RISERDescription - 2-1/2" HEAT RISER
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$35.39
211303” HEDDER RING MECHANICAL/VACUUM OPERATED HEAT RISER VALVE3" HEAT RISERDescription - 3" HEAT RISER
$46.02
211402 1/2” BALL and SOCKET E.F.E. MECHANICAL/VACUUM OPERATED HEAT RISER VALVE2-1/2" HEAT RISER, BALL/SOCKET STYLEDescription - 2-1/2" HEAT RISER, BALL/SOCKET STYLE
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$35.52
211503” BALL and SOCKET E.F.E. MECHANICAL/VACUUM OPERATED HEAT RISER VALVE3" HEAT RISER, BALL/SOCKET STYLEDescription - 3" HEAT RISER, BALL/SOCKET STYLE
$41.32
 
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http://hedman.com/images/ePIM/original/21120.jpg