2" BSP Screw on Tank Boss
thingiverse
This is a 2" BSP Tank boss, designed to be screwed to a polypropylene or other plastic fuel tank. It has three holes for using 4mm stainless steel screws, or M4 stainless bolts. The boss will need to be bedded down on to some form of sealing compound between it's bottom surface and the tank to ensure a water-tight seal, and a suitable sealing washer will need to be placed between the boss' top surface and whatever you are screwing into it. I've used it to mount a Tekelek TEK766 Ultrasonic Tank Level Sensor to a home heating oil tank, but it can be used for any fitting with a 2" BSP external thread and a flat mating surface.
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