Epoxy or Super Glue?

[ATLL765]

I'm trying to attach an 1/8" nylon hose barb to my pvc overflow, but I'm not sure what to use. I've read super glue won't bond to nylon well, so I was thinking about epoxy. Should I use the putty that you need or the stuff you should mix?

This isn't going anywhere near my tank or water for at least 24 hours, I don't know if once epoxy cures if it's inert and it won't really matter if it's "safe" while curing. Just trying to make a watertight seal for the nylon hose barb.

 

[Fish Brain]

What do you need the hose barb for?


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[malulu]

crazy glue or epoxy probably not going to be water tight...
however, you can try to use this

and then wrap with this...
http://www.lowes.com/pd_26668-66601-86001_0__

make sure to pull it tight while wrapping...
good luck

 

[Ls2Goat]

I'm trying to attach an 1/8" nylon hose barb to my pvc overflow, but I'm not sure what to use. I've read super glue won't bond to nylon well, so I was thinking about epoxy. Should I use the putty that you need or the stuff you should mix?

This isn't going anywhere near my tank or water for at least 24 hours, I don't know if once epoxy cures if it's inert and it won't really matter if it's "safe" while curing. Just trying to make a watertight seal for the nylon hose barb.

I've never had success connecting a barb to a piece of PVC directly, you might want to go about connecting a barb to the PVC pipe then just using a standard tube/hose with clamps to make the connection.

homedepot.com/p/3-4-in-Schedule-40-PVC-Pressure-Slip-x-FPT-Adapter-435-007HC/100033499#.Uhwq_z-jtB4

homedepot.com/p/Watts-1-2-in-x-3-4-in-Plastic-Barb-Union-A-386/100123571#.UhwrbT-jtB4

 

[Cdiggy]

Best bet would be to find a PVC hose barb adapter and use PVC glue or Teflon tApe if it is threaded. Are you using hose barb and hose to keep the noise down on the vent? Just curious. I'm not sure they make PVC hose barbs in 1/8 but I'm sure they make adapters like 1/4 male pipe threAd x hose barb.

 

[ATLL765]

Best bet would be to find a PVC hose barb adapter and use PVC glue or Teflon tApe if it is threaded. Are you using hose barb and hose to keep the noise down on the vent? Just curious. I'm not sure they make PVC hose barbs in 1/8 but I'm sure they make adapters like 1/4 male pipe threAd x hose barb.

They make em in 1/8". It only took me 2 weeks and about 10 different hardware stores to find it, lol. I ended up finding it on Amazon Supply, which I didn't realize existed until 3 days ago.

It's for the aqualifter pump that will allow my pvc overflow to restart siphon if an outage were to occur.

I ended up grabbing some JB waterweld. I have teflon tape and some mounting tape, not sure what that magic wrap stuff is like malulu, but I got all kinds of tape laying around that varies from fabric hockey tape to electrical tape.

If I'm gonna use the epoxy, should I try wrapping it with teflon tape first to get the best seal?

 

[Cdiggy]

Teflon tape (as pictures) is for threaded adapters and such. If they are threaded than use the tape. If it is not than use the epoxy. Still not sure what your adapter is going into. If straight into the PVC like 1 1/4 inch and it is just a hole being drilled into the side of the pipe epoxy may not be strong enough. PVC glue is designed to melt both pieces of PVC to created the bond though I doubt it will work on nylon. Two different animals. I am assuming the pump would supply water pressure to the overflow on that case a tee added to the down pipe with the necessary adapters to reduce it down to 1/8 hose barb would be the ticket. All this is assuming the pump is supplying the syphon tube water to recreate the action you are looking for. HTH

 

[Cdiggy]

Oh and just for the record, as a general rule. NOTHING sticks to Teflon.

 

[ATLL765]

Essentially this is what I made and the barb adapter is going basically where shown in the diagram:

http://www.aquariumlife.net/projects/diy-overflow/120.asp

If the connection were to not be perfectly water/air tight, would it make much of a difference? The aqualifter pump will be running 24/7, so would it just suck tiny air bubbles through rather than leak water out?

And if I were to get reducing tee to fit a 1/4" threaded barb adapter, does it matter where I put it? A majority of the upper half of the pvc plumbing is already cemented, though there's spots I could cut and install a tee; I'd just prefer to put it below the tank because I painted everything black that would be visible and don't want to ruin that with a big 'ol white tee in the middle of it.

 

[Cdiggy]

Just go get the correct tap for the correct hole size for the screw adapter. Without looking at the adapter I would say it should be 1/8" NPT (nominal pipe thread). The tap will have the correct drill bit size to use to properly tap the hole. It is pretty straight forward. It is almost like using a self tapping screw. It will make the threads that you need to screw the adapter in. The Teflon tape gets rapped in the same direction as the direction of the threads on the adapter. Pretty simple actually. Don't just glue or epoxy it. Anything worth doing is worth doing right! The tap is maybe only a ten dollar part. The bit maybe two bucks. Just make sure you match the threads on the adapter to the threads on the tap and then match the drill bit size to the one the tap says to use. If it is not on the package of the tap it will be etched on the side of the tap. There is also 3 different taps... They have different tapers to screw threw the metal. Since you are working with soft plastic it should not matter which one you use. HTH

 

[ATLL765]

Just go get the correct tap for the correct hole size for the screw adapter. Without looking at the adapter I would say it should be 1/8" NPT (nominal pipe thread). The tap will have the correct drill bit size to use to properly tap the hole. It is pretty straight forward. It is almost like using a self tapping screw. It will make the threads that you need to screw the adapter in. The Teflon tape gets rapped in the same direction as the direction of the threads on the adapter. Pretty simple actually. Don't just glue or epoxy it. Anything worth doing is worth doing right! The tap is maybe only a ten dollar part. The bit maybe two bucks. Just make sure you match the threads on the adapter to the threads on the tap and then match the drill bit size to the one the tap says to use. If it is not on the package of the tap it will be etched on the side of the tap. There is also 3 different taps... They have different tapers to screw threw the metal. Since you are working with soft plastic it should not matter which one you use. HTH

Right now, all I have is the 1/8" couplings I got, but I know tractor supply 20 mins away has 1/4" thread to barb adapters.

To make my life easier, i.e. not having to buy a tap. In the diagram, basically where the outside U is teed off to send it down to the sump, there pipe that comes up vertically to an elbow to use as another point for the plumbing to rest on the tank. Could I just replace the last elbow that hangs down on the inside lip of the tank with a threaded elbow and a reducer to make it 1/4" threaded, then just teflon tape and screw it in? It shouldn't matter where the hose adapter is placed, right?

 

[Cdiggy]

Maybe. Changing the location of the barb might require the pump to work harder to get the syphon going again which, depending on the pump, may or may not be able to handle it. Only real way to know is to do it and see if it works.

 

[ATLL765]

Maybe. Changing the location of the barb might require the pump to work harder to get the syphon going again which, depending on the pump, may or may not be able to handle it. Only real way to know is to do it and see if it works.

I ended up turning that elbow up and getting a threaded push fitting to put the airline into. Wrapped it with teflon then that magic wrap stuff. Works great and starts the siphon pretty quick. No leaks yet, lol.