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The shape of the hat acts as funnel. The hat leaves its shape serves funnel but this type cannot close itself because the opening is permanent. The nail made of brass permits a regulating at the two positions closed / opened..
double model permitting the simultaneous lurification of 2 zones with a flow adapted to each zone

GITS BROS model.

model with reservoir in plastic. The opening of debit is achieved while pulling the superior plug and while positioning the small stem vertical out of the hole of rest (see dark zone on the right on the hat).
The regulating of the flow makes itself by the wheel blocked by the nut of the low.