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Cathar · 09-30-2002, 05:18 AM

I don't pretend to understand why, but the maximum barb size for a particular BSP thread is 1/4" larger than the thread size given.

For example, a 1/4" BSP thread will allow for a 1/2" barb size with no flow restriction. A 3/8" thread will allow for a 5/8" barb size, and so on.

Go figure.

I didn't invent the standard.

In other words, the Eheim 1250 has a 3/8" BSP thread with a 1/2" barb on it. However, if one so wishes, they can stick a 3/8" thread - 5/8" barb on it.

09-30-2002, 05:18 AM	#9
Cathar Thermophile Join Date: Sep 2002 Location: Melbourne, Australia Posts: 2,538	I don't pretend to understand why, but the maximum barb size for a particular BSP thread is 1/4" larger than the thread size given. For example, a 1/4" BSP thread will allow for a 1/2" barb size with no flow restriction. A 3/8" thread will allow for a 5/8" barb size, and so on. Go figure. I didn't invent the standard. In other words, the Eheim 1250 has a 3/8" BSP thread with a 1/2" barb on it. However, if one so wishes, they can stick a 3/8" thread - 5/8" barb on it.