Muab ob npaug rau 11X Arm-Tree Percolator Bong iav yeeb nkab

Qhov no yog 12.9 "siab ncaj bong nrog ob chav chamber, ob chav muaj tib lub 11-arm ntoo lim, zoo li tsob ntoo perc bong los yog tshauv catcher bong vim tsis muaj chaw ntxiv los tuav cov pa luam yeeb, yog li nws yooj yim kom tau. Lub tshuab ua kom du thaum muaj cov ntoo lim ntau dua thiab cov pa taws nkag mus rau hauv lub ntsws sai dua, tsob ntoo perc yuam cov pa luam yeeb kom huv si hauv dej, tag nrho cov bongs tuaj nrog cov khoom sib xws.