American Educational Products LLC has been supplying the highest quality classroom materials domestically and internationally for more than 70 years, With our creative in-house product development team, we are able to introduce new products on a yearly basis, Our products have helped teachers bring the joy of discovery, through hands-on and investigative learning styles, to generations of students, We are sincerely proud of our legacy and we promise to strive to meet the needs of present and future students as they prepare to become knowledgeable and successful world citizens, How do porosity and permeability affect the distribution of aquifers, Help students study these important concepts and integrate math measurement and percentage skills, Kit includes- tube, drainage fixture, screen, beads, Teachers Guide, American Educational Products have a lead ship time of 21 days, SKU: AMED3506