Bulkhead fitting with flange on both sides of the
bulkhead/liner/container wall. Insert silicon seal allow to cure,
then tighten, or compress the silicon seal.

May be more expensive, but it will save time and energy.

Not sure where I'd get the parts for this..they don;t really have a lot
for this type of setup in the local Lowe's, keeping in mind this is for
either 3/4 inch or 1" pvc pipe.

Hi Gary - Hal is right - Bulkhead fittings are the answer, for any thickness
of plastic or rubber, just make sure you tighten it - I use it on 45 gal
plastic barrels for bio-filters - no leaks - they come from 3/8" up to 2"
and maybe larger - go to a farm supply store that has supplies for sprayers
for fields - up here in Canada a 2" fitting is about $15 Can - smaller ones
are less - I would never use pvc fittings and any kind of glue - Bulkheads
around here are used on up to 5000 gal (and maybe larger) tanks with no
problem - my filter has been running for 12 yrs - no leaks
Gale :~)