Wifler Industries MP-1 Plunger Black MP-001BK

No mechanical parts;Less affected by rain and temperature compared to traditional plungers;48 micro adjustments per turn;Dynamic non-linear response

The MP-ONE is a magnetic plunger with no moving parts, saving you the hassle and frustration that comes with a broken spring. No mechanical parts and materials less affected by rain and temperature compared to traditional plungers. 48 micro-adjustments per turn.