Abstract: A funnel for introducing and dispensing a material may include a first hollow frusto-conical structure including an intake port and a first exit port, where the diameter of said first exit port is smaller than the diameter of the intake port. The funnel may include a second hollow structure including a sealing element for sealing the first exit port. The second structure may mate with the first structure for forming a passage from the first structure through the second structure. Rotating the second structure with respect to the first structure may bridge a gap between the sealing element and the first exit port for sealing the passage. Other embodiments are described and claimed.