Subject: The last 4 mm step should feel stiff tech. Уважаемые переводчики! Помогите, пожалуйста, разобраться, что означает 4 mm step should feel stiffв таком контексте: Filter element must be changed every 3 months. Mark the date when it is put on and make sure to keep this interval. Start by putting filter sides blue fittings into filter holders sockets. Flow arrow on incubator and on filter should be to the same direction. Then press parallel both angle fittings (by two hands) into the hole till they snap into place. The last 4 mm step should feel stiff.
Заранее благодарю!
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