Teledyne Republic Free Flow In-Line Check Valve. This is a new surplus item (New/Old Stock) and does not come in original packaging. Part Number 448-12D3-6.
specifications here: http://www.detectors.saint-gobain.com/uploadedFiles/SGdetectors/Documents/Product_Data_Sheets/BC400-404-408-412-416-Data-Sheet.pdf 2" X 2" X 1.5" thick NOTE the opposite sides are water clear. The edges will be saw cut and not smooth due to machining. It is up to the user to polish the sdes ( not needed for use) or not as you desire.
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