RODI coupling under negative pressure

[alemone]

Can somebody recommend a 1/4" coupling for a RODI line that works under negative pressure? The regular push connect fittings leak in those circumstances.

 

[Daddi0]

https://www.ebay.com/itm/19-5041-Un...816609?hash=item3650433861:g:1UgAAOSwTs5dGM-K
Could probably find it cheaper though

 

[alemone]

https://www.ebay.com/itm/19-5041-Un...816609?hash=item3650433861:g:1UgAAOSwTs5dGM-K
Could probably find it cheaper though

OK. Thanks. I sure hope I can find it for less than $15.