In English wine cask units a butt or pipe is made up of two what?

Capacities of wine casks were formerly measured and standardised according to a specific system of English units. The various units were historically defined in terms of the wine gallon so varied according to the definition of the gallon until the adoption of the Queen Anne wine gallon in 1707. In the United Kingdom and its colonies the units were redefined with the introduction of the imperial system whilst the Queen Anne wine gallon was adopted as the standard US liquid gallon.

The butt (from the medieval French and Italian botte) or pipe eventually became 126 US galons (105 imp gal; 477.3L).

Of comparable size to the beer hogshead, the wine hogshead was equal to half a butt or a quarter of a tun. A hogshead is a large cask of liquid (or, less often, of a food commodity). More specifically, it refers to a specified volume, measured in either imperial or US customary measures, primarily applied to alcoholic beverages, such as wine, ale, or cider. Eventually, a hogshead of wine came to be 63 US gallons (52.5 imp gal; 238.5 L) which is half the amount of a butt or pipe.