The Spunding Valve assembly is as follows, going from left to right and then up and down.
-modified stainless tailpiece
-1/4" NPT Hex Nipple (McMaster #48805K81)
-1/4" NPT Cross (McMaster #4464K312)
-1/4" NPT x 1/8" NPT Hex Nipple (McMaster #48805K86)
-Back Pressure Relief Valve (McMaster #99045K46)
-1/4" NPT Gauge from Ebay
-1/4" NPT Male x Female 90Âº Elbow (McMaster #4464K36)
-1/4" NPT valve from Ebay
-1/4" NPT x 3/8" ID tube barbed adapter (McMaster #5670K85)
The 24" Thermowell is from Brewers Hardware
Sealing the Thermowell is a 1/4" NPT x 3/8" OD tube compression fitting (McMaster #8239K22) which is threaded into another modified stainless tail piece. The o-ring that seals the thermowell to the compression tube fitting is McMaster #5233T52. The compression fitting had to be modified by drilling it through to a 25/64" ID. The Shut-off Valve is from Micromatic
The modified tail pieces were made from a 5/16" Micromatic
unit. The barbed section was cut-off, then the base was drilled out to 7/16", then tapped with a 1/4-18 NPT pipe tap.
The racking tube that goes in place of the thermowell for transfers is McMaster #9797T142
The original keg stem has the ball and spring removed and the stem is cut off just passed the indents for the spring.