Hauv kev lag luam niaj hnub tswj kev lag luam, wafer kos li qub yog ntau thiab nrov dua vim tias lawv cov qauv tsim, yooj yim ntawm kev teeb tsa thiab qis dua tus nqi pib & txij nkawm piv nrog cov tsoos flanged viav vias checks.BVMC muaj ib phaj thiab dual phaj wafer kos li qub nrog ntau yam khoom.