Question re Eheim 1250
 

I want to get an Eheim 1250 and upgrade to all 1/2" ID tubing. As I understand it the inlet on the 1250 is set up for 1/2" tubing but the outlet is 3/8". My question: What do I need to get so that my Ehiem is ready for a 1/2" system -- everything else will have 1/2" tubing.

Product SKU's or links to McMaster.com would be greatly apprciated. Thanks.

All fittings on the 1250 use NPT fittings and are detachable. You can just hook on some 1/2" barbs. That's what most people do.
-Kevin

I just received my 1250 today. If you take all the fittings off on the pump u r left with 2 female ntp threads. Inlet is 1/2" and outlet is 3/8".

Just go to hw store get 2 1/2" barbs. One w/ 1/2 " npt threads, the other w/ 3/8" threads.

Hope it helps

the outlet is supposed to be 1/2" on these. but it has threads like a 3/8" what gives with that? where can you buy ones that fit like theirs do? i wanted to put a 90 at the exit but now i guess i'll just stick with the one that comes from the factory....

3/8" NPT isnt smaller inner diameter than 1/2" BARBS. Just take ur pump to the hardware store.

U need a couple pieces to make it an elbow without cutting flow too much.

First piece is a 3/8" X However long u want it NIPPLE It is basically a small piece of pipe with 2 male 3/8" npt threads. YTou screw that into the outlet of pump.

This is the part that u need: male pipe to female threads. 1/2 male 3/8 female. Connect that to nipple. on th e3/8 side.

Then you need to go up to 1/2" npt cause the 3/8 elbows restrict a bit too much. You need a female female 1/2" elbow. Connect that to the reducer u just installed.

Now all you need is a 1/2 npt 1/2 barb for the 1/2 in hose.

Hope it helps

Nope, actually 1/4" NPT has the same ID as 1/2" barbs. 3/8" is actually a reducer. think of it this way, 1/2" barbs are designed to fit into 1/2" ID, so the OD of the barbs is just a hair over 1/2". NPT refers to the ID of the fitting. Therefor 3/8" NPT is 3/8" ID and about 3/4" OD. It is kinda confusing, but not that difficult.

Huh?

I have that pump and I could have sworn that one fitting was 1/2 and the other 5/8. :confused:

i don't understand when you say "3/8" is a reducer" do you mean 3/8" hose barb on a 1/4" npt?

all i know is this. i am holding in my hand 1/2" x 3/8"NPT hose barb, and when you look through it, it is the same diamater through the whole thing.

so i don't know how a 1/4" NPT has the same ID as the 1/2", you might be right though, i have never held in my hand a 1/2" x 1/4" hose barb.

deez

i think i will just buy a 3/8" barb which DOES screw in and take a 1/2" drill bit and make my own. i seem completely unable to find the correct animal around here.

You americans should just give it up. The metric system rulz!! :D

ok jonas, you don't have to buy a 3/8" barb.

let me try to explain the difference. first the outlet of the pump. you need a 1/2" x 3/8" hose barb. the reason for the difference in measurements is because the first figure, 1/2" is referring to the ID of the hose it will fit. the 3/8" is the size of the pipe thread. they are two different measures, but when you look at it, they are the same.

for the output, you actually need a reducer. you need a 1/2" x 1/2" hose barb. the second figure is actually pretty big when you look at it, but again, it is NPT, national pipe thread. that is all you need for your pump, and they should be easily availabe at any hardware store. if not, you can go to www.mcmaster.com and order the nylon ones, around $8-10 with shipping. that is all.

i know, i just did this last week. i have it sitting right here. 1/2" x 3/8" for the outlet, and 1/2" x 1/2" for the inlet.

deez

you must have better hardware stores. all i can find is reducers or same size. like 1/2-1/2 npt, and 1/2-3/8 npt where it is a reducer. i may have to order from mcmaster, but they only sell packs of 10 usually. thats al ot of extra fittings

those should be the correct fittings. when you are looking at the outside of the whole fitting, yeah the threaded side is bigger than the barb side right? mine is too. but look through the hole, it is the same all the way through. no reduction.

i mean, these measurements are pretty much universal/standardized, i don't think my 1/2" x 3/8" is any different than the one at your store.

why don't you just buy one, take it home, or do what i do, take the pump right into the store. then put it on, and see. take your waterblock to compare too. you will see they are the same size barbs.

maybe i should take some pictures and send it to you?

actually i have both sitting right here in front of me. 1/2-1/2(for 1/2" tubing) and 1/2-3/8(for 3/8" tubing) the latter has exactly the right size for the outlet, but you can look from the bottom(the direction the water is goingto go) and it is def a reducer. i must be confused, or they must just not have the one i need as i have looked at every fitting hd or ace or lowes have and no luck. even tried menards. they have 1/2" for 1/2" tubes, and 1/2 for 3/8" tubes, but no 3/8" for 1/2" tubes....see what i mean? confusing.

If you can't find one, then make one up. I did that on my 1048.

Get a 3/8" to 1/4" Bushing and a 1/4"x 1 1/2" brass nipple. The 1/4" nipple OD is the same size as a 1/2" barb fitting and will fit a 1/2" hose.

ok, i don't know what is going on here.

when you say "1/2-1/2(for 1/2" tubing) and 1/2-3/8(for 3/8" tubing)" and the last one is exactly the right size for the outlet, then the second figure, 3/8" is correct, since it fits the outlet. but how is it that it is 1/2" and only fits 3/8" tubing? are the two fittings, the one for the inlet and the one for the outlet, are the hose barbs the same size? if not, then you have a 3/8" x 3/8" hose barb, not 1/2" x 1/2". because since they both are 1/2" (for the first of the two measurements) they should have the same size barb, just different sized backsides. get it? there is no way that both can be 1/2" and one fits a 3/8" hose.

look at the fittings, and tell me if the hose barbs are the same, if they are, then you are all set. but if the outlet one only fits 3/8" ID hose, then you definitely have in your hands a 3/8" x 3/8" hose barb.

i am sending you some pictures, that will illustrate this. i will send to your email listed here.

maybe I'm nutz, I just streched the cheapo vinyl 1/2 ID over the 1250's intake. I'm sure the silicon (which streches better I'm told) will do the same.
I just hose clamped it well. 4 weeks, no leaks.