They also make PVC hose adapters. A few other standard PVC fittings to adapt from the 1" stuff on the sewer solution to the 3/4" ID of the adapter, and you have it. Browse the PVC pipe and sprinkler fitting aisle of the local big box home center for inspiration.
You can build darn near anything with PVC fittings and glue, IMHO
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'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it