18mm male thread to 1" bsp piping

[rumple]

Hi guys,
seasons greetings.
 I've bought an eductor off Uberveg (great service, thanks) that has 18mm male threads. As per above the pipework on my plastic tank has 1" fittings. What's the best way to adapt the eductor to the pipe? I've looked for suitable fittings online but can't seem to find anything suitable.
Has anyone come up with a method of clamping the pipe  to enable it to be height adjustable to raise or lower  the eductor to account for different volumes of liquid? Or is it a case of topping up to the required height with more oil for the second stage?
Any help would be welcome.
I will be flitting around today so won't always have access to the internet.
Thanks in advance,
Mark.

[Tony]

It's not 1/2" bsp then?  That's 18.6mm minor thread diameter 21.0mm major.

I plan to mount my eductor low enough to mix both stages and for stage 1 use a second pump to splash oil down through any floating meth layer (the only reason for placing the eductor near the surface is to suck down any floating meth).

[Jamesrl]

It could be 3/8" NPT or you could ask the supplier what it is.

[rumple]

Thanks for the responses so far.
I got the eductor off James Jenkins via VOD. Here's part of a response to a mail:
"for your 50 lpm pump I have the correct eductor in both 16 and 18mm thread".
So I assume there must be quite few eductors out there with the metric threads.

[rumple]

Should have done some more playing around first! Just found that the nut off a standard 15mm compression fitting is the right thread. I was starting to think I'd have problems mounting the eductor- that's what comes of being a plumbing amateur .

[Julian]

An eductor connection will be at a relatively low pressure.

If I require odd fittings, I tend to solder two fittings together to make what I want.  It helps if you can adapt the connection by filing, turning or drilling so there's a good, close fitting, area for the solder to stick to, but generally the method works quite well.

[K.H]

15 mm and 1/2" fit together, so i guess its 1/2" BSP you have

[Jamesrl]

Asolutely, 15mm compression fitting threads ARE 1/2" Bsp.