If you're asking if they exist. Yes they do. They are usually called Copper (15mm or 22mm) to 7lb Lead. It is called 7lb lead because each yard of copper used to weigh 7lb (pounds). You can get this adaptor but they are quite expensive and comprises of two compression fittings, one each end.
A gallon is certainly not metric. It is imperial.
Imperial.
Metric tons can't be converted to imperial gallons. Metric tons measure mass, while imperial gallons measure volume.
There is no such thing as a metric gallon. The metric measurement is litres. There are 4.54609188 litres to an imperial gallon.
A tonne is a metric measurement.
adaptor - a fitting used to connect different pipes
imperial - Elvinusa
The opposing systems are imperial and metric, not customary. But, meters are metric.
I'm guessing by customary, you mean imperial. if so inches are customary/imperial
It is neither.
No. It is imperial.
74.480 Tonne. No need to use the word metric . A Tonne is metric , whereas a Ton is Imperial. They are spelled differently so that we all know which is Metric and which is Imperial.