A honey wagon is a truck that comes by and sucks the poop out of your black tank. Some campgrounds offer this service. Its nice if you don't have a site with full hookups and you don't want to pack everthing up and drive over to the dump station. The problem with GMCs is that they have Thetford fittings and those are uncommon. Honey wagons are setup for standard fittings. So ths is an adapter that will allow the honey wagon hose to work on your GMC. I found this at my local RV supplier and it cost $6
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