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no they're not brass, they're the proper plastic one's for underground, so thats one thing in my favour.

by my calculations its about 32 gallons (145L).

Hi, I have a ground source heat pump with a slight leak in the underground loop, which is 400M of 32mm plastic pipe, there are some joins along its lengh which have compression fittings on although i'm not sure where these are as it zig zag over about .25 of an acre. I was thinking of...