I don’t think that’s a plug on the return line. I believe there is a slit in that red rubber piece and if you pinch it you can see it open up. I assumed that it was there to create a stream in the return so it wouldn’t cause a bunch of splash and air bubbles. Someone will need to fact check me on that though.
LittleBeefy aka Chad
“Dot Doitall”: 1984 Bronco XLT
460 (C8VE), Edelbrock Pro-Flo 4, ZF5, NP205, D44HP solid axle, 4.56
urban assault vehicle
"Bebe": 2022 Bronco Badlands 2dr
2.7l, Sasquatch, Iconic Silver, Black Marine-grade interior, hard-top
"Celeste": 1979 Porsche 928
4.5l K-jet, 5-sp, S4/GTS brakes, LSD, Pasha interior