HomeHPLC - Mass SpecWB401WB401 WB401 Add to quote This product is already in your quote request list. Browse the list Description Description WB Scientific Part WB401 OEM Part 700002968 Models ACQUITY® H-Class Bio QSM, ACQUITY® I-Class BSM, ACQUITY UPLC® I2V BSM, ACQUITY UPLC® BSM, nanoACQUITY UPLC® BSM/ASM Description: UPLC Check Valve, Double Ball & Seat, 2/pk