And in case any other person is looking at making drybags with air
release valves (and to save time)

I am also looking at the valves at
www.shipstore.com/SS/HTML/SEV/SEVTVL.html, a valve base with push-in
type plug.
These valves are much less expensive than the the BCD type valves. On
smaller drybags in stuffed in a kayak or bicycle pannier or BOB (tm)
trailer, a less durable and less expensive valve may work.

I did stop at a local scuba shop and purchased one BCD dump valve/over
pressure valve ($US 12). It will be installed on a larger backpack
style drybag (70 liter or 110 liter in size and used when canoe
camping in the Boundary Waters Canoe Wilderness Area). This large
drybag gets more abuse than drybags stuffed in a kayak. I have a few
other, larger canoe drybags that will get this more expensive BCD type
valve. I will also shorten the string and not put on the plastic pull
tab - to prevent accidentally release.




The valve at NRS Float Bag Valve
http://www.nrscatalog.com/product.asp?pfid=3875 is most likely the
lowest cost, although I doubt I could get your price of 8 for $1.00

Those drysuit valves are kinda big and likely a lot more than the
$0.30 for the NRS valve. A quick google scan on the drysuit valves
yields prices between $50 and $100!!

And yes, the drysuit dump cuff valves are relatively expensive.
The Apeks Drysuit Cuff dump is as of October 16, 2003 11.75 GBP
(United Kingdom Pounds) or about US $20, shipping not included as
listed
at http://www.divebooty.co.uk/equipment...ls.asp?pid=276,
Description:
Totally free from maintenance and requires no adjustment. Designed to

There may be another type of valve, but I can't think of one. Those



And I strongly prefer to avoid pulling out a damp or wet sleeping bag
along with damp or wet clothing out of a drybag with a OPV or purge
valve that released.

At www.gmcscuba.com (Global MFG. Corpo, 1829 S. 68 Street, West Allis,
Wisconsin 53214, U.S.A. in my part of the world, makes a purge valve
for lift bags. It is listed on page 7 on their online catalog, in the
communication products and support gear section, item number 57030
Purge valve Purge Valve for Lift Bags. These are sold at local
scuba shops in the Minneapolis, Minnesota, U.S.A. area. I will look
at these valves.

At www.underwaterfloation.com/drybags.htm, there are Prolift over
pressure valves used in liftbags. Prolift Over Pressure Valves are
available in 2 styles. The two piece black screw type is used on our
smaller liftbags and requires no special tooling for installation.
The large white PVC Valve is used on larger liftbags and requires a 1
1/2" flange to be installed.
OPVBLK - Over Pressure Valve Black $9.00
OPVWHT - Over Pressure Valve White $12.00
And liftbags could make the world's largest sponsons, making a kayak
unsinkable (just kidding .

I assume these purge and over pressure valves are similar to BCD
valves, although I do not have a BCD (just a simple kayaker, no scuba
experience).


I have spent far more time looking at valves than I initially planned
(and looking at scuba related gear in the process).

Scott