The TiAL® Q Blow Off Valve Bottom portion will allow you to re-fit a TiAL QR Blow Off Valve to be fully vent to atmosphere. This Q BOV bottom half fits right up to the top part of the QR without any modification. Simply unbolt your QR as if you were swapping springs and switch all the internals into this vent to atmosphere body. The spring pressure will remain the same as it was in the QR. Each piece is CNC-machined from 6061 aluminum alloy, just like the QR, and anodized to match perfectly. You’ll never know it wasn’t a TiAL® Q BOV from the start!