40mm pressure relief valve

Pressure relief valve for dust extraction system, prevent the collapse of your dust extraction system if all the blast gates are closed.

In use: https://youtu.be/qsIcvbP6d3U

Designed to fit UK 40mm solvent weld waste pipe (FloPlast) - It might be a little loose depending on your printer / pipe fittings - Fusion 360 file included to allow for changes - Change the outerDiameter parameter to adjust that.

Needs a 50mm long, 12mm diameter spring (0.5*12*50) (I used: https://www.ebay.co.uk/it