Assertion: toilet paper's tank | /r/HasProperty | needed
Facets:
Source sentences:
text: This system is suitable for locations plumbed with 1⁄ 2 inch (13 mm) or 3⁄ 8 inch (9.5 mm) water pipes which cannot supply water quickly enough to flush the toilet; the tank is needed to supply a large volume of water in a short time.