Master Diver
Posts: 394
Joined: Sat Jul 02, 2005 12:45 am
Location: Minneapolis

New silcone Duckbill

Thu Jan 14, 2021 3:13 pm

Hi Rob's new silicone duck bills are fantastic ! Endorsed by the one and only Kemp's Cow! :D :twisted:

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Greg Barlow
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Joined: Wed Jul 20, 2005 1:26 pm
First Name: Greg
Location: SW Ohio

Re: New silcone Duckbill

Thu Jan 14, 2021 3:55 pm

I have a few of them already. They are awesome, as they are the original shape, but composed of food grade silicone.

Greg Barlow
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Master Diver
Posts: 1576
Joined: Thu Apr 08, 2010 11:25 am
First Name: Mark
Location: Laguna Beach, CA

Re: New silcone Duckbill

Sat Jan 16, 2021 6:54 pm

I put one in my Trieste rebuild and one in my Titan II/Fx conversion.

Good quality stuff!

"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968) :D

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Master Diver
Posts: 327
Joined: Tue Oct 04, 2016 7:26 pm
First Name: Phillip
Location: Belmont CA

Re: New silcone Duckbill

Sat Jan 16, 2021 8:35 pm

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!

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Master Diver
Posts: 1616
Joined: Sat Jan 01, 2011 2:03 pm
First Name: Eben
Location: Alexandria, MN
Contact: Website

Re: New silcone Duckbill

Tue Jan 19, 2021 11:35 am

I ordered a couple, too. Website says there are only 25 left.
Image ... y=20208401
The Freedom and Simplicity of Vintage Equipment and
Vintage Diving Technique are Why I Got Back Into Diving.

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Danny D
Lung Diver
Posts: 53
Joined: Tue Jun 26, 2007 6:05 pm
Location: North East

Re: New silcone Duckbill

Fri Jan 22, 2021 7:15 pm

What are the benefits of these over the DBEs? I used to use duckbills and then switched some years ago.

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VDH Moderator
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Joined: Thu Jun 30, 2005 9:28 pm
First Name: Luis
Location: Maine

Re: New silcone Duckbill

Sat Jan 23, 2021 12:06 am

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.

Buceador con escafandra autónoma clásica.

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