1, Ukulungiselela ngaphambi kokuqala 1). Ngokuhambisana nephampu yokugcoba amafutha, asikho isidingo sokwengeza amafutha ngaphambi kokuqala; 2). Ngaphambi kokuqala, vula ngokugcwele i-valve yokungena yepompo, vula ivalve yokukhipha umoya, futhi iphayiphi nepayipi lokungenisa amanzi kufanele ligcwaliswe ngoketshezi, bese uvala i-exhaus...
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