Imperial and metric

[Budd]

How comes some pipe fittings/ tube is in metric and some is in imperial like 3/8 drinking line? Many thanks

 

[Paulus]

Never heard of drinking line!

 

[Budd]

Used for drinking water filters ect

 

[Killy Bing]

Times change, imperial is changed over to metric

some air lines are still done in imperial, as is air con i think.

 

[Mike Jackson]

It's so us old boys don't feel left out.

 

[Chalked]

Caravans and motorhomes still use 1/4 and 3/8 tube. I have no idea why!

 

[albatross]

How comes some pipe fittings/ tube is in metric and some is in imperial like 3/8 drinking line? Many thanks

It's historic and times change. British Empire and USA were all imperial but we have gone metric as we are closer linked to Europe these days. Steel threaded pipe does have modern metric names but the old names stick.

3/4" is officially called DN20 as its 20mm nominal internal diameter. (DN=diameter nominal. French.)

Diameter Nominal (mm) To Nominal Pipe Size (inches)