Enhance Multi-Link OD 16mm fitting doesnt thread into the Heatkiller 4 Pro acrylic CPU waterblock

Question

I have purchased the black sparkle enhance multi-link fitting (BP-BSEML16) for my 16mm OD hardline tubing. When attempting to screw the fitting onto the Heatkiller IV Pro Acrylic (by Watercool) the fitting seizes up after a quarter turn. When I screw an X-Cross fitting or a Stop fitting (all bitspower black sparkle) it goes in all the way without resistance.

When I measured the external diameter of the fittings with my caliper, all the enhance multi-link fittings were 0.1 - 0.2 mm (or ~ 0.010") larger than the X-Cross or the Stop fitting.

This extra material is preventing me from screwing in the fitting into the acrylic as it seizes up after a quarter turn and if I force it, I cannot physically turn it to the point where it even begins to compress the O-Ring.

What should I do? Is this a manufacturing defect? Would the fitting leak if I screw it into the acrylic as much as possible without compressing the o-ring?

Answer 1

Dear Zoltan,

Thank you for contacting Bitspower.
Did you try the other BP-BSEML16?
Please note that all fittings must be used with O-rings.
If all BP-BSEML16 fittings have the same issue, it is not a manufacturing defect.
It means that BP-BSEML16 is not compatible with your Heatkiller IV Pro Acrylic water block.

Alternatively, you can use an extender—such as the BP-BSWP-C95—on your water block,
and then connect it to the BP-BSEML16 fitting.