An apparatus is disclosed including: a housing including a conduit having an inlet port and an outlet port; an insert at least partially disposed within the conduit and including a tapered portion extending from a narrower end proximal the inlet port to a wider end distal the inlet port; and a facility for adjusting the position of the insert within the conduit. In some embodiments, the apparatus is configured to receive a mixed flow of liquid and gas at the inlet port, direct the mixed flow through the conduit around a portion of the insert disposed within the chamber, and outlet the mixed flow at the outlet port.

An apparatus is disclosed including: a housing including a conduit having an inlet port and an outlet port; an insert at least partially disposed within the conduit and including a tapered portion extending from a narrower end proximal the inlet port to a wider end distal the inlet port; and a facility for adjusting the position of the insert within the conduit. In some embodiments, the apparatus is configured to receive a mixed flow of liquid and gas at the inlet port, direct the mixed flow through the conduit around a portion of the insert disposed within the chamber, and outlet the mixed flow at the outlet port.

A tap assembly (100) for a beverage container, wherein the tap assembly (100) is configured to selectively allow the passage of fluid along a fluid flow path from a source of pressurised fluid, comprising an inlet (102), an outlet (104), a first valve (120) for allowing passage therethrough, the first valve (120) comprising an orifice (124) and a first movable component (122) is movably located in the orifice (124), wherein the first movable component (122) and the orifice (124) have complementary shapes such that a flow area of the first valve (120) increases, from a rest position to a fully open position.