Top-up nozzle for packraft boston valve

prusaprinters

<p>This design is aimed for water-borne users who require a way to top-up a low-pressure inflatable craft remotely without having to put their mouths directly to the boston valve.</p><p>More specifically, I made this for my Telkwa <a href="https://www.diypackraft.com/">DIY packraft</a> so I could top it up while paddling without having to weld a separate permanent top-up valve in the tubes.&nbsp;</p><p>Unfortunately not all valve manufacturers make their threads exactly the same, so while it is very close to 7/8-14 UNF, it is incompatible. Thread pitch is exactly the same but diameter is off by almost 2mm.</p><p>You will need flexible tubing. The nozzle is dimensioned for 3/8" ID - ½" OD tubes. At the other end, you can use a twist valve like this <a href="https://www.nrs.com/nrs-float-bag-valve/plb3">NRS model</a> as an airtight mouthpiece.</p><p>You have two options for printing:</p><ul><li>separate knob and nozzle<ul><li>the knob can slide over, but once there is a tube on the nozzle, it's not possible</li></ul></li><li>print-in-place parts<ul><li>you will need supports under the nozzle baseplate, but be careful not to put any inside the tube</li><li>you also need supports under the barbed nozzle tip.</li></ul></li></ul><p>The parts in the pictures are print-in-place. After removing supports, you'll need to apply some downward pressure to unlock them. I pushed on the butt end of the nozzle so I didn't risk damaging the tip.</p>