There seems to be 2 versions of the Scepter plastic jerry cans. Early ones with a round hole in the sealing face for venting and the later ones with an oblong hole for venting .
The early ones seems to have more examples where the cap is hard to screw on/off regardless if it is under pressure/vacuum.
When those cans pressure up or get a vacuum on them they are nearly impossible to open by hand I use a strap wrench picked up from C-tire for just that.
The later style can still be tough to open when under pressure/vacuum but can be done by hand.
When I buy the plastic CF jerry cans now I make sure I only by the later style ones.
Personally I prefer the plastic jerry cans over the older steel ones, they are way tougher than the steel ones, they do not rust and do not get near the condensation in them, plus they do not leak.
Matthew
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