TSS / Breather plug with valve with sphere Breather plug in aluminium alloy with galvanized-steel cover and specially-designed internal valve with steel sphere and inox spring, calibrated from 0,05 to 0,10 bar, which opens at intervals to vent internal pressure created by fluid turbulence and keep out foreign bodies. It is especially recommended for applications on Speed-shift Gears, Agricultural over-Gears and industrial Speed-Reduction Gearboxes.