Brass barb fittings for poly pipe

[Bob S.]

I plan to connect a new run of 3/4" ID poly water pipe from the well in my summer camp this year. I bought 3/4" brass barb fittings to join sections but they seem very loose fitting inside the poly. Do you need to heat the poly to compress with clamps or use some kind of compound for a tight seal? The plastic barb fittings are VERY tight inside, but I'd prefer to use brass for strength and longevity. Anyone have guidance to offer? Thanks! Bob

 

[Valveman]

The barbs on plastic or brass should be the same size. They have to be pretty tight to start with, but even then heating a little is recommended.

 

[Sponsor]

 

[Reach4]

I presume you have the wrong barbs. If you got a pex fitting, that would be very loose.

https://www.homedepot.com/p/Water-Source-3-4-in-Brass-Male-Insert-Adapter-MA75NL/203449562

 

[GORP]

I plan to connect a new run of 3/4" ID poly water pipe from the well in my summer camp this year. I bought 3/4" brass barb fittings to join sections but they seem very loose fitting inside the poly. Do you need to heat the poly to compress with clamps or use some kind of compound for a tight seal? The plastic barb fittings are VERY tight inside, but I'd prefer to use brass for strength and longevity. Anyone have guidance to offer? Thanks! Bob

I am having this issue now. Can you provide an update on how you addressed it? I thought everyone measured 3/4" the same too, yet the brass is too small, like I need 13/16 or 7/8 to fit the 3/4 pipe.