When you have a cyclon vacuum cleaner in your workshop and you don't want the dust tank will br squeezed by the pressure, then you need to instal this automatic vacuum release valve on your tank lid.

Easy to print and assemble, it just requires few additional parts to complete.

1 stainless steel hex bolt 5MA x 50mm

2 stainless steel washers 5MA

1 stainless steel lock nut 5MA

1 stainless steel compression spring ext dia 10mm, int dia 8mm, lengh 25mm

6 stainless steel hex bolt 4MA x 15mm

6 stainless steel washers 4MA

6 stainless steel lock nut 4MA