HomeHPLC - Mass SpecWB420WB420 WB420 Add to quote This product is already in your quote request list. Browse the list Description Description WB Scientific Part WB420 OEM Part 430002357 Models ACQUITY® H-Class QSM, ACQUITY® Isocratic Solvent Mgr, ACQUITY® M-Class µASM, ACQUITY® M-Class µBSM Description: Tube Assembly, Transducer to Check Valve