Eheim 1250 out-take only 3/8" ?
 

Hi all,

I just got my Eheim 1250 from D-Tek and noticed that the out-take is only 3/8". This system will be 1/2". Is this going to restrict the flow noticeability even if i get DDan's Pump Adaptor? I'd really like to replace the 3/8" barb with 1/2" but i can't find any stores here that sell eheim parts. As much as we love DDan, his adaptor looks a little ghetto :p

another question is about that blue sponge. when i opened the box, the sponge was outside of the eheim. the manual shows the sponge inside the gray cage. (dumb question) should i put the blue sponge in the cage as described or did d-tek/eheim leave it out for a reason?

You mean 3/4", not 3/8", right? 3/4" inlet is what the Eheim 1250 has.

http://www.eheim.com/technik_pumpen.htm

The problem is finding adapters that match, because I believe that they are metric (someone correct me?).

nope, i mean 3/8" an 1/2"

http://geeksupport.com/temp/eheim/top.jpg
Top - Out Take
http://geeksupport.com/temp/eheim/front.jpg
Bottom - In Take

awesome. found a replacement part at cooltechnica (http://www.cooltechnica.com/Merchant...duct_Code=MPAE). these guys are gonna hate me. this will be the 3rd appended item to the free-shipping WW block :p

[edit]
arg. it's for the intake, not out-take

He's right it seems that all the piping sizes are over stated.I'm new to water cooling and have just begun to collect parts for my system.
I do piping for a living so I pretty much know pipe sizes when I see them.The 1250,which I also have over states their sizes.The inlet is a half inch pipe but the barb is for 3/4 tubing.The outlet is 3/8 thread the barb is half inch.So hes right.
I have also seen where barbs are 1/2 inch with 3/8 pipe thread well basically all you are doing is reducing for 1/2 to 3/8 so you have a restriction.So in these system where people are running 1/2 tubing it would seem that they have more restrictions then they think.

what's the difference between Polypropylene and nylon fittings?

You'd have a hard time using glue on polypropylene, where nylon will glue very easily.

Otherwise, I believe that they're the same (except for the color). Nylon may be slightly stronger, structurally (used in bolts).

That blue sponge I put it in... I had it out at the start but I realised that is is great for soaking up any small leaks I get at that inlet, they evaporate better there. ;)
The leak is fixed now but the sponge is still there (mainly due to the fact I can't get it out now.)

~ Boli

thanks for the info everyone.

so i take it that all 1/2" folks either use the DDen mod or just stick their 1/2" tubes on the 3/8" outlet?

My 1/2" tygon seems to fit just fine over that fitting and does not seem to restrict the flow at all.

Heck, I even considered replacing that connector with a plastic 1/2" but decided that the O-ring was a great thing to have around and it had a nice locking unit.

It still has not leak for me.........<looks for wood>

great to hear, thanks, though i'll be using cheaper ClearFlex 60.

i wonder why they decided to make them differen sizes than both 1/2" or both 3/8"

3/8 NPT threads are bigger than 1/2 ID tubing size, so there won't be any restrictions from that.
The sponge acts as a filter for the inlet when the pump is used submerged. No need for it if you are going inline. Some people used the sponges in their res if there was a problem with bubbles getting sucked into the system.

peace.
unloaded

In the UK and AU I found both brass and plastic replacement barbs that are 1/2" on the output side. http://www.radiical.com.au/Water%20Cooling.htm Has anyone seen these here?

Not sure how much these still restrict.

What is the "DDen mod"?

I also am finding that the hose tends to leak using a plastic hose clamp or the spinny thing. I am really suprised.

Thanks,
...Rich

The 3/8 thread my be as big as the 1/2 id but its not possible for the id of a 3/8 fitting to be 1/2 inch, its 3/8.The od of the thread does not translate to the size of the hole through it.3/8 means that the size of the hole is 3/8 which is not ,as far as I know as big as 1/2 inch.

dden mod: http://www.dangerden.com/Instructions/pump_adapters.htm

could you rephrase that?

If it helps any i'm going to use 1/2"ID ClearFLEX 60 Premium Tubing with 1/8" thick walls.

Does anyone know of stores (in USA) that carry these eheim adapters? I'll try looking at home depot this week.

so the brass is better (with O-ring right?)

The 1250 comes with two output fittings. One for hose and one that has a smooth cup. Since my system is running right now I can't measure the hose fitting but I can measure the second fitting. The ID of the threaded side of the fitting is 1/2" the cup is 3/4". If you go to http://www.dtekcustoms.com/product.asp?3=64 you see the parts I am talking about. They have G 3/8" next to them which only adds to the confusion.

Thanks,
...Rich

I don't know. I am very much a noob.

Thanks,
...Rich

OK I'll try,It's just that it would be easier if I could show you.

I hav ethe 1250 also and I also noticed that the sizes werent right.THe barbs for the tubing is the stated size,1/2 in and 3/4 in,but the threaded side of the fitting is the diffence.The 3.4 barb has a 1/2 thread which means that it is 1/2 in,the hole is 1/2 in not the od of the threads .The same with the 1/2 barb which is 1/2 but the threaded side is 3/8,the hole is 3/8.This is a reducer,3/4 barb by 1/2 thread,1/2 barb by 3/8 thread.

If you have a 1/2 pipe nipple around just thread it into the inlet side of the pump and you will see,its 1/2 in.So even though you may get to use 3/4 tubing on the inlet or 1/2 tubing on the outlet there is still a reduction at both points.

This is what Ive been noticing with all the wc stuff.Just because you can run 1/2 tubing it seems that its all being reduced to 3/8.And the 3/8 tubing is worse as it reduces to 1/4.

Now you guys have me measuring everything. I found that my MCW5000P hose barbs and the various "T"'s and "L"'s D-Tek sent me are all 3/8" ID.

The threaded side of the 1250 output is still 1/2" ID. Let me know if you want me to take a picture.

...Rich

Unless there is a new revision of the 1250 I cant believe its 1/2.Try to threads the inlet fitting into it,it wont go.

nyyanks,

are you saying that 1/2" tubing will still work fine even though the holes are 3/8" and 1/2"? When i say holes, i'm referring to the images i took above w/ the ruler.

richyoung,

Thanks for all the measuring :D. My main concern is if my 1/2" tubing will work as-is or if i need to purchase any additional attachments to make it work with the Eheim 1250.

Oh yea,the tubing will work fine on the outlet side anyway dont know if you can get 1/2 tubing ove the 3/4 inlet.

I just saw at cooltechnica they have 1/2in barb by 1/2in thread fittings if you cant get the tubing over the 3/4 barb.

My point was to confirm what you had noticed about the sizes not being completely what they are stated as.And to point out that all the worry about too many restrictions in a loop were not taking into concideration that there are more restrictions then most believe there are.

To do that I will have to drain the system which I can do tomorrow.

Does your 1250 have the second output fitting that is on the picture at DTek?

Do you mean the pump adapter barb?