OBD Easy Change Floatline End Plugs (Pair) allows you to make your own tube floatline. 

Pair of plugs will do both ends of your 6-7mm ID tube.

Screw fitted ends allows easy interchange of fittings of your choice, up to 5mm.

Great for make thinner diameter tubes for reef hunting and or current/deep diving where thinner tube offer less drag and resistance.

Dimensions:

• 46.5mm long
• 3mm inside cordage hole
• 12mm connection end diameter with 3mm disconnect screw
• 3.5mm waist diameter for tie-down valley
• 6.5mm sealing shoulders diameter 
• Fitting aperture 5mm