2" slip is designed to slip over pipe with 2" inside dimension or 2" spigot.
2" spigot is the same dimensions as pipe with 2" inside dimension. Fits into 2" slip.
4 - 3/4" Smooth Barbed Ports are designed to fit inside 3/4" clear tubing or flex pipe
Manifold must be glued into place
It is highly recommended to glue tubing onto smooth barbed ports, as well as clamp into place if using clear tubing. If using flex pipe clamps are not necessary.
Unneeded ports can be plugged with 3/4" new style manifold plug, sold separately.