An apparatus for filling differently sized containers with fluid includes a filling head having a fluid holding area. At least one multi-container filling nozzle connected to the filling head, wherein at least two containers with differently-sized openings are fillable with a quantity of fluid from the fluid holding area without changing the multi-container filling nozzle. Related methods and devices for filing containers with differently-sized openings with fluid without changing a fluid nozzle are also disclosed.

A gas stem assembly is disclosed including a vent tube having at least one protrusion extending radially from the vent tube and a receiver having a non-circular opening and an attachment surface at an end of the non-circular opening. The vent tube is at least partially insertable through the non-circular opening of the receiver when the vent tube and the at least one protrusion are aligned with the non-circular opening. The attachment surface of the receiver contacts the at least one protrusion to inhibit the at least one protrusion from passing back through the non-circular opening when the at least one protrusion is misaligned with the non-circular opening.

A valve assembly for a machine for filling containers with a liquid has an adduction conduit extending along a valve axis and connectable to a tank of the filling machine to allow inflow of the liquid through a discharge mouth. A shutter arranged inside the adduction conduit and moving along the valve axis between a closing position and one or more opening positions has an annular gasket that with the shutter in the closing position sealingly engages an abutment seat. The annular gasket has a first annular portion for sealingly engaging a first portion of the abutment seat, and a second annular portion for sealingly engaging a second portion of the abutment seat. At least one flow window interrupts an annular continuity of the second annular portion and allows a partialized flow of liquid through the adduction conduit when the first annular portion is spaced apart from the abutment seat.