Homemade sap extractor, what type of container to use?

[Gromyjoe21]

I got my sap extractor running and it works great! But as soon as my vacuum reached 20"hg, my container collapsed. The container I found is a sump tank made of 1/2" plastic ( I think its abs ). My lid is 3/4" acrylic plexiglas which holds up fine. I managed to rig up a brace inside but I know it wont last long.

So what did you use as a container? I've seen a couple made from booster tanks but I cant find any under 500 bucks. Did anyone find a material that holds up to high vacuum but doesnt cost an arm and leg?

[maple flats]

Most are made using 8" or larger PVC pipe. Vacuum of 20" will give a lot of pressure on every square inch against the outside of that tank.

[Bricklayer]

Schedule 40 pvc will work great. Hard to find end caps and fittings for anything over 4” though
If you can get your hands on blue schedule 80 water pipe that is what the commercial ones are made of.
Very expensive for fittings so if you can make caps out of plexi glass that’s best. And the schedule 80 is over 1/4” thick so threading fittings in is better. More meat for threads.