Used as inlet port on O2D1 & O2D2
Requires use of 4 mm Poly tubing PN 19600-0002-00
Requires use of 2.5 mm hex wrench to remove and install.
Fitting one touch 4mm x 6-1.0mm
$4.00
Fitting one touch 4mm tube x 6-1.0mm thread
Fitting one touch 6mm x 6-1.0mm