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john44 · 08-04-2003, 01:04 AM

I checked here and at the Eheim wedsite and they state that the intake barb outer diameter is 17mm and the output barb outer diameter is 13mm. So if I multiply 17 X 0.0394 I get .6698 inches. If I divide 5 by 8 I get 0.625 inches. So it seems that the best size tubing I can buy to connect the 5/8 inch barb from the resevoir would be the 5/8 " It looks like the 3/4" would be to large. I am wondering though why the 1/2" tygon seems loose on the original ouput barb on the pump as some people have reported on this forum because when you multply the 13mm stated by Eheim for the output size you get 5.122" that should make a nice tight fitting. Is the barb smaller than 13 mm or is the Tygon 1/2" a slightly lager inner diameter?

08-04-2003, 01:04 AM	#5
john44 Cooling Neophyte Join Date: Aug 2003 Location: Illinois Posts: 5	correct size I checked here and at the Eheim wedsite and they state that the intake barb outer diameter is 17mm and the output barb outer diameter is 13mm. So if I multiply 17 X 0.0394 I get .6698 inches. If I divide 5 by 8 I get 0.625 inches. So it seems that the best size tubing I can buy to connect the 5/8 inch barb from the resevoir would be the 5/8 " It looks like the 3/4" would be to large. I am wondering though why the 1/2" tygon seems loose on the original ouput barb on the pump as some people have reported on this forum because when you multply the 13mm stated by Eheim for the output size you get 5.122" that should make a nice tight fitting. Is the barb smaller than 13 mm or is the Tygon 1/2" a slightly lager inner diameter?