$3.25
Irritec Perma-Loc hose fittings are a reliable and versatile way to connect to poly tubing. Based on a spin-lock design they provide easy installation, a reliable grip, and can be removed and reused if needed.
Use the 20 mm x 3/4 Socket / 1" Spigot Tee to connect a PVC riser to a center-fed 20 mm (.720 x .820) tubing. Tubing ID can range from .685" to .740".