One reason for the location may be due to winter weather. Did you buy an RV with special winter features? That would require the drain which is full of water to be inside where it can be kept warmer. Very good feature for those who use their RV to go snow skiing or other winter sports.
The pressure of the liquids will be very little as it is determined not by the volume but the difference in the height of the water and the drain, so likely less than ten PSI.
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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