https://shop.winonaconcrete.com/Products-Lookup/80-1435-015.html
Winona Concrete & Pipe Products Ltd | Poly Pipe Insert Fittings|FA 1.5" PVC ixft
poly insert fittings
https://www.shcsupply.com/departments/insert-fittings--nylon--amp--poly-%7C90%7CF15%7CF1561.html
INSERT FITTINGS- NYLON & POLY
insert fittingsnylonpoly