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New silcone Duckbill

Posted: Thu Jan 14, 2021 3:13 pm
by SeaHuntJerry
Hi Rob's new silicone duck bills are fantastic ! Endorsed by the one and only Kemp's Cow! :D :twisted:

Re: New silcone Duckbill

Posted: Thu Jan 14, 2021 3:55 pm
by Greg Barlow
I have a few of them already. They are awesome, as they are the original shape, but composed of food grade silicone.

Greg

Re: New silcone Duckbill

Posted: Sat Jan 16, 2021 6:54 pm
by ScubaLawyer
I put one in my Trieste rebuild and one in my Titan II/Fx conversion.

Good quality stuff!

Mark

Re: New silcone Duckbill

Posted: Sat Jan 16, 2021 8:35 pm
by Vancetp
I saw these. I've been buying the neoprene ones from elsewhere, b/c of the formed shape. These look good! I also noticed old style band clamps with the knurled nut on Rob's site. Kew!

Re: New silcone Duckbill

Posted: Tue Jan 19, 2021 11:35 am
by SurfLung
I ordered a couple, too. Website says there are only 25 left.
Image
http://thescubamuseum.com/Online%20Stor ... y=20208401

Re: New silcone Duckbill

Posted: Fri Jan 22, 2021 7:15 pm
by Danny D
What are the benefits of these over the DBEs? I used to use duckbills and then switched some years ago.

Re: New silcone Duckbill

Posted: Sat Jan 23, 2021 12:06 am
by luis
They are just vintage. There are no advantage to a duckbill. They work OK. But there are reasons why you don't see them on any modern gear (rebreathers, single hose regulator exhaust, SCBA valves, other breathing devices, or many other low pressure differential check valves, they normally use mushroom valves). BTW, modern mushroom valves are very different and have evolve a lot from the early flat rubber valves. There is a lot engineering design and analysis into the geometry of what looks like a simple mushroom valve.

The vintage duckbill actually have a bit of a constriction to the flow. The rectangular cross section of the duckbill has a reduced flow area, but in a double hose regulator is not normally an issue.

These ones, made out of silicone are much better than the originals and will not bond to the inside of the metal horns. The silicone is flexible and will not deteriorate like the originals.

Re: New silcone Duckbill

Posted: Wed Jun 30, 2021 4:09 pm
by hgslick
These look awesome and I really like that they arent so floppy but the additional thickness when installing hoses is noticeable

Re: New silcone Duckbill

Posted: Wed Jun 30, 2021 8:02 pm
by antique diver
hgslick wrote:
Wed Jun 30, 2021 4:09 pm
These look awesome and I really like that they arent so floppy but the additional thickness when installing hoses is noticeable
Does the thickness make installing the original hose clamps difficult?

Re: New silcone Duckbill

Posted: Wed Jun 30, 2021 10:38 pm
by hgslick
It did for me

Re: New silcone Duckbill

Posted: Thu Jul 15, 2021 3:55 pm
by SeaHuntJerry
You can get stainless longer screws at Ace hardware,not really a problem #56 here :twisted: :mrgreen: in Cow Town!