... defended to overfill protection device,It is a safety and credibility;4,it of the physical volume be small and weight ... ,Its take is a convenience;5,It meet the related request of the ISO10079-2.TECHNIQUE:In the vacuum of creation inside of 10s≥0. ... While max vacuum of arriving,the number of times stepped to move≤12,Pedalpressure≤245NNormal foot work,the discharge is in the 10s≥200mLMax freed ...