Brand new SQV blow off valve
The HKS type Blow-Off Valve (SSQV) is a dual stage pull type blowoff / bypass valve. Being of a pull-type valve structure, the SSQV can not physically leak under any level of boost because boost pressure also keeps the valve closed against its seat. The SSQV is actuated by pressure alterations only, not by the rate of pressure or vacuum in the line, which ensures a quick valve response and complete closure when off throttle.

Features:
1) Quality control: all our BOVs are thoroughly tested to make sure the valve
    opens and closes properly at the set rates on the springs. The allowable errors
    for opening and closing of the valves are controlled within 2% more or less.
    The servicing life of springs and diaphragms used for the BOV lasts for 200,000
    times of operation.
2) Materials used for making BOV are high quality aluminum alloy 
3) Accessories: flanges, bolts and gaskets are included