| 摘要 |
<p>A unit (30) having a main cylindrical body portion (32) defining a bore (33) that is attached to the dispense tap in a public house bar, and which is internally screw threaded (37) at its lower end. The unit (30) has a manually operable adjustment member (38), a movable member (40), and an orifice plate (42). The orifice plate (42) has a central plate (47) provided with a central hole (48) and five peripheral holes (50). The position of a spigot (64) in the central hole (48) determines the flow through the peripheral holes (50). The unit (30) enables the user to determine the quality of the head on the beer dispensed.</p> |
