Cannibus:
Take look here
www.eheim.com/technik_pumpen.htm
Hint Metric Pipe Thread has equivalent in US Pipe. Was it 17MM?
Ah it's 13MM thats 1/4" NPT x 3/8" I.D. Barb
- Actually you should use copious amounts of Teflon tape and/or both Teflon tape and Liquid White Teflon as the 13MM tap is started lower in the top housing. The Eheim 1048 is also 13MM and with "normal" amount of teflon tape - there shows a dab of seepage. Along with the Green Food Dye.
While you're there pickup an assortment of spring steel hose clamps. Brown, Red and Green. You'll need mainly reds. Should be 20 Cents a piece.