The heavy spring is what comes standard in Fusion Engine and F2 HPA systems. It is also the "extra" spring that comes with the Kythera system.
PolarStar Fusion Engine/F2/Kythera Heavy Nozzle / Poppet Spring 10000388
$5.95
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PolarStar Fusion Engine/F2/Kythera Heavy Nozzle / Poppet Spring 10000388
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