This spunding assembly includes everything you see in the photo (if you select Ball Lock in the dropdown)
The assembly includes the following:
Threaded 1/4" NPT Tee
0-30 PSI Gauge threaded into one port.
Adjustable PRV (Pressure Relief Valve) Modified for lower pressures in another port
Options for the remaining "tank connection" port:
Ball Lock or Pin Lock Gas QD, SANKE, or 1.5" TC adapter (select in drop down)
Note that if you select SANKE, the input to the spunding will be a tailpiece and beer nut but it does NOT include a keg coupler. If you are connecting to a conical fermenter, the 1.5" TC option would make sense.
Note that if you also want to be able to feed pressure into the same system, we have a spunding available with a ball lock gas input post as well.
*note that we've modified the PRV to have a lighter spring in order to make the lower pressure adjustability more sensitive in the 0-30 PSI range. We don't know the exact maximum pressure it will hold, but it is at least 30 PSI. The PRV has pressure markings on it but the new spring re-calibrates the unit such that the markings are completely unreliable. Vent pressure must be set by watching the gauge.
Uses? Measuring carbonation level in a keg already carbonated (measure temp, measure constant pressure over an hour, refer to carbonation chart), Vent a keg that is naturally carbonating with priming sugar to avoid overcarbonation, pressure ferment in a corny (the true meaning of spunding).
We've had a lot of questions about how to use this device. First, please be aware that we don't
have a lot of experience using spunding for pressure ferments but here are a
few notes. You can use this device to check and/or vent a keg that has had the
gas source disconnected. If you want to just use it to check pressure, turn the
PRV all the way clockwise so that it doesn't vent and then connect to the keg's
gas post. If the pressure is higher than you wanted, turn the PRV
counterclockwise to allow venting.
In order to set the PRV pressure for venting
during fermentation, it's best to pressurize the keg first to just over your
desired vent pressure, rotate the PRV clockwise nearly all the way and then
attach the spunding valve to the keg. Rotate the knob counter-clockwise slowly
until it begins venting. Find the spot where it vents down to your desired
pressure and then stops. To check that you've set it properly, remove the
spunding, repressurize the keg to a few PSI above your set pressure and then
reattach the spunding to watch for appropriate pressure venting.
sounds tedious but gets much easier after you've done it once or twice. You can
also save gas by connecting the spunding directly to a gas source using our
ball lock jumper post.
If you don't have a CO2 source, it would be best
to start using the spunding until after fermentation has become quite active.
That way it will be building pressure while you are working on adjusting the
Warning:We recommend using a corny keg with a lid mounted
overpressure vent in ADDITION to using the spunding. It's always better to have
redundant overpressure protection when fermenting in a pressure vessel.
NOTE: the pressure scales on the adjustable vent are meaningless, ignore them. We have changed the stock
0-100psi spring out for one that is closer to 0-20psi. If you want it to hold a
little more pressure, you can remove the spring, stretch it out so that it
measures about 1.25” at rest and reinstall. We’ve also included the stock
spring in a little zip lock bag should you wish to restore it to full 100psi
capability (NOT RECOMMENDED)