Re: Hose barb size
If you match the hose barb size to the hose size, you'll get a good fit. Barb sizes always refer to the OUTER diameter, hose sizes always refer to the INNER diameter. Warming the hose a bit (if you use a heat gun, be careful not to melt the hose!) and lubricating both the inside of the hose and the outside of the barb with dishwashing liquid will make it easier to put it on the barb. Don't use any grease...you'll have a permanently slippery connection.