Review on 🚽 437 Bottom Drain Holding Tank: 22-1/2" x 18-1/2" x 6" - Enhanced for SEO by Ashutosh Takumatla

Ideal for school children. I lifted the bottom six inches and then dripped in. I made a hole in the floor of the bus for drainage and one in the ceiling for ventilation. What to look for: The vent is near the flange. If you have a hand flush on the same side as the vent, it will most likely block the flush handle. This happened to me, so I went 90 degrees straight out of the vent to the far corner of the bathroom and then 90 degrees up through the ceiling.