Looking to make a cheap custom coolant overflow, cant fine one locally where i live, getting it shipped is like 40usd just shipping alone so that isnt worth
leaning to towards that 'ghettorade' overflow^^^.
So i got my fitting, and hose for neck->bottle, then another hose that goes into the bottle/tank. Will i need to poke a breather hole at the top? Will i also need to make another fitting for an overflow hose(thinking i wouldnt need one since i like to check my bay from time to time).

It needs a way to breath, at least a vent is what I would do, otherwise it will either blow the bottle up or crush it depending on temp.

motomattx said:

It needs a way to breath, at least a vent is what I would do, otherwise it will either blow the bottle up or crush it depending on temp.

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Aha yeah, okok. Will poking a hole beside the fitting be okay?
So to properly fill the system, fill the system from the neck till full then fill the bottle half way?

This is what I did it worked perfectly. I know you dont have the oem cap but if you can find just the cap it has the vent and everything built into.
Thank you for your time, Jason Penny

Yeah unfortunately i have no access to just the cap, dsms are rare where im from .
ended up making one out of a Gatorade bottle