using DWV (drain) pipe in reflux still ??

[eternalfrost]

so ive been having a real pain in the arse finding large diameter pipe in my town. checked the big stores and the scrap shop. so i decided to go looking online.

found some really good deals right off the bat. my one question though is if its ok to use DWV grade pipe. i looked it up and basically all copper pipe by law has to be 99.9% copper, the difference between the 'L' 'M' and 'DWV' is just the wall thickness. DVW isnt rated for any pressure so cant be used to carry water except for drainage. because of this its like 1/4 the price.

since all still dont build any pressure by design it should be AOK to use yes?