KaiWei said..
These M12 X 1,5 screws from Amazon work perfectly as a replacement for my Flikka GoreTex vent: www.amazon.de/dp/B0DC9NG8V3?th=1

The get them here would be $40 pr.

But they don't

salt makes them useless
the manufacturer of the vents produce a spec sheet that shows they should be not used like this.
so why install a $2 part that is not fit for purpose, into a $3500 item! Just wondering

decrepit said.. There are a number of people here that get away with not undoing their bungs.

Most of the crew I sail with don't touch our bungs. Never a problem and we're in QLD. Except once. A large portion of deck. That was due to no resin sticking to the blank. Unless sitting in the sun for a while ,stored in a van , on roof racks or in a plane , I leave mine alone. We don't leave our boards roasting in the sun. We pull our boards out , rig up , go sailing and pack up. This seems to be fine.I believe boards puff up more if there is water inside. Constantly screwing the bung in and out is asking for trouble. Sand will flog out the O,ring and seat. Unless you can keep it anally clean , which you can't at the beach. If you look carefully , the seat of the O,ring will look bad with bits of sand squashed into the plastic ripping groves into the O,ring. Have a close look at your O,ring. If you're an unscrewer , I'd highly recommend replacing the O,ring every dozen times. And make sure the seat is in good condition. I would guess most people don't touch their bungs. There seems to be possible issues both ways and also venting bungs. In the old days we never had vents and I'd never seen a board explode . Every second person had a windsurfer and stored them on roof racks. The sun must have been different then when smoking was healthy.

Imax1 said..

decrepit said.. There are a number of people here that get away with not undoing their bungs.

Most of the crew I sail with don't touch our bungs.

Why do all major board manufactures install bungs and always deliver them with the bungs removed and why do they all recommend that the bung is removed between sessions?

It's a 2 minute task before and after a session which ensures that board is not subject to undue internal pressure while in transit by car, truck or air and in storage at home.

It's a safety for them to stick in a gore thing that is used outside its design specs... but might work just long enough and after a year who knows who cares. That's my issue.

I see many real delam (skin lift off foam) with what's call closed cell foam with single skin over, pu foam (surfboard foam) and XPS ( a winner for delam nightmare foam), nowadays black board fashion help a lot form massive delam! With eps core it's like Decrepit say, foam separate 1 or 2 cm inside, because of texture skin stick well to foam. With good quality, but denser, eps less risk. Never see bic techno, 20 to 25kg/m3 molded eps, delam like that, but they are in heavier side.

needsalt - replace it with a Moz retro fit ! ......... and read the spec sheet for these Gore-tex vents .

From what I`ve gathered from peoples comments is that the Gore-tex vents stop venting out pressure rather than the water ingress and It`s the quality of board construction that determines delam happening or not , or when .

If you are worried with gore vent, replace with a screw system and only think navigation.

I see a reason. tell me if the membrane is intact in your vents. With certainty..

Mark _australia said..
I see a reason. tell me if the membrane is intact in your vents. With certainty..

I think I'm more concerned about that than failed venting...

Wish MOz would do some kind of annual repair trip to the east coast. Or just clone himself...

lemat said..
I think this low torq is more to avoid screw breaking.

yes it's a crazy design, the head will snap off at the drop of a hat.

What about a pressure vent?!
Yes it's too big at 3/4" BSP thread and you would need to clean sand from around the pressure o ring.
I have seen a vent body machined from PVC (for extremely corrosive chemicals that eat into stainless 316). Reduce size to M12 thread.

It has to be a better solution to current gortex vents

For NZ we don't have the intense heat of WA summer to bother.

Thanks Imax, appreciate your reply.
So what pressure do you think is appropriate?
With most higher pressure valves, they have specific springs for pressure range.
This set up would depend on how much the spring is compressed and at low pressure it becomes harder to re seat the o ring.
The lowest pressure one of my customers want is 0.15bar - a fleas fart! My supplier has recently changed from imperial (PSI) to metric (bar)
The above, you could reverse the cap head to the top and use a weaker spring.

I have put together a simple CAD file for an emergency basic vent screw. I have 3D printed a few up to test on Mark_Oz test rig.
The slot to tighten is M6 fin washer size. If anyone wants details or the .stl file just let me know, but otherwise I will report back after a bit of testing.

I've had two boards explode, one had a screw which let water in cos of the crap screw design with an o ring. Then exploded on the beach. Board two broke cos I didn't get all the water out before repairing it and the goretex didn't breathe water. . All my boards are goretex plugs and I have no problem.