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Question about "DWV" endcaps

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Question about "DWV" endcaps

Unread postAuthor: jmccalip » Mon Apr 20, 2009 8:00 pm

I bought a heavy duty(thick PVC) end cap at Lowes that looks identical to this:

Image

I see many people using these, but they are labeled DWV? They are still pretty hefty , and I'm not sure if it's safe to use them.

I also had the same question for the black reducer shown:

Image

Thanks
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jmccalip
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Unread postAuthor: jmeyer1022 » Mon Apr 20, 2009 8:07 pm

Everything I can see here looks DWV. Those might not be clean outs there, but adapters. You can tell NSF-PW by the socket depths and the shape. That's a bell reducer which is also DWV, Look for pressure rated bushings which will require a coupling. If your at Lowe's look down the plumbing isle more. They have 2 sections, DWV which will likely be filled with 3" and 4" and then their small stuff to their 2". Most Lowes in my area won't go about 2" for pressure rated but I have heard of some doing so. Good luck.

http://www.spudfiles.com/spud_wiki/inde ... sure_rated

Scroll down you'll see the difference.
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Unread postAuthor: Technician1002 » Mon Apr 20, 2009 8:15 pm

jmeyer1022 wrote:Everything I can see here looks DWV. Those might not be clean outs there, but adapters. You can tell NSF-PW by the socket depths and the shape. That's a bell reducer which is also DWV, Look for pressure rated bushings which will require a coupling. If your at Lowe's look down the plumbing isle more. They have 2 sections, DWV which will likely be filled with 3" and 4" and then their small stuff to their 2". Most Lowes in my area won't go about 2" for pressure rated but I have heard of some doing so. Good luck.

http://www.spudfiles.com/spud_wiki/inde ... sure_rated

Scroll down you'll see the difference.


This looks like a copy of this cannon. For your answer to how this construction holds up, look at the photos on the bottom of the third page on the instructables site.
http://www.instructables.com/id/S67VTL2F5LD8J8D/

The full cannon is here;
http://www.instructables.com/id/Colossal-Cannon%3a-Building-a-behemoth-piston-valved/

Make improvements or suffer the same longevity.
:shock:

I do have a thread on using ABS DWV in an air cannon. It is not recommended, but it seems to hold up better than PVC DWV.
http://www.spudfiles.com/forums/abs-cellular-core-test-cannon-t17968.html

I hope this helps.
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