Plumbing - transition from 1-1/2 PVC to 1-1/4 irrigation pipe

[newbury]

What is the best way?
I've a long (both in time and physical length) buried 1-1/4" irrigation pipe that was installed about maybe 45 years ago for sump pump drainage from my house. This was pre check valve (back flow preventer) etc. It ends by coming through my concrete block wall inside the house with a barbed right angle fitting.
I'd like to transition from that to 1-1/2" PVC to get to my check valve then to my sump pump.
But the PVC fittings and 1-1/4" to 1-1/2" adapters I have on hand do not fit tight on the irrigation pipe.

 

[ponytug]

I guess the first question is why not reuse the old fittings, but moving on.

If it had barbed fittings, you probably need an 1 1/4" hose barb adapter to NPT and go from there. Polyethylene pipe generally goes by ID, IIRC, and PVC goes by OD. I would measure before trying to find a new barb adapter. A little heat and some lubricant goes a long way with poly pipe to barb connections in my experience. I am a fan of hose clamps that have an interior metal plate to protect the pipe from the screw, either the bolt versions, or the worm drive with an extra tab underneath the threads. They seem less prone to leaking, at least in my experience.

More o pipe sizing here;

HDPE Pipe Sizes & Dimensions | WL Plastics | Polyethylene Pipe Sizes

At WL Plastics, we manufacture high-density polyethylene (HDPE) piping in sizes ranging from ¾” to 54” diameters. Explore our available sizes today.

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All the best,

Peter

 

[newbury]

Thanks, I may have found a solution, I'll try and go from the barbed male fitting at the wall to a section of 1-1/4" irrigation pipe (IP)---> a barbed 1-1/4" with 1-1/4" male NPT---> standard PVC size (1-1/4" Barbed Insert x 1-1/4" Male NPT Threaded PVC Adapter)