Summary

Typically the Foam Lance bottles come with no cap.The cap allows you to store the washing liquid in the bottle.

The cap suites on the bottles with 1" pitch 4mm treading

Recommend to print 45 tilted as the tightening the cap can easily split the horizontal layers. Also some added filament flow might enforce the object.

The original cap is challenging for the layer adhesion hopefully the thicker one does the better job.

Due a limited layer adhesion the stronger I made a stronger one (foamcap).