When there is no Stump pipes for your waste such as when you are House sitting etc. and instead of just letting the pipes lay about the ground I have found by putting a washing bag as a sock over ends if drain pipes and clamping it tight around the pipes,
I don't have to worry about snakes or any other visitors popping up in the van while having a shower etc. plus stops ants as well.
It also collects the rubbish that you put down the drains so leaving the area clean.
Pretty cool idea - you'd have to be careful with it because if it blocked full of food scraps then it would back up and flood the shower floor (lowest point in van).
Maybe a semi-loose fitting elastic band would allow the sock to release if full.
We are staying in a rainforest house and yesterday I forgot to put the bag over the pipes after I moved them, only remembered when heard a scream from wife in shower, up the pipe came about 4 small green frogs and 2 stuck to her leg, she had no idea what had got her till I started laughing and pointing, she said that they were cold and slimy on her leg.
Seems I am in trouble again
Dave
Ps it was funny but....
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Traveling it leaves you speechless, then turns you into a storyteller.
We are staying in a rainforest house and yesterday I forgot to put the bag over the pipes after I moved them, only remembered when heard a scream from wife in shower, up the pipe came about 4 small green frogs and 2 stuck to her leg, she had no idea what had got her till I started laughing and pointing, she said that they were cold and slimy on her leg. Seems I am in trouble again
Dave Ps it was funny but....
Heh heh, they do get kind of excited bout that sort of thing, at least it wasn't a snake.
My home made filter to catch small food particles and stop unwanted visitors via the drain pipe, constructed from inch and a quarter pvc pipe and bits available from Bunnings all for less than $10 and it can be used right up to when it finally gets knocked off like the last one. easy to make and cheap. picture attached
I wonder just how many instances of "snakes or other visitors" entering a van/motorhome/RV via the sullage pipe have been experienced. 
