Rivers Metal Products offers pneumatically operated drop boxes to facilitate the adding of foam or an additional charge of resin to a mold while it is in the oven. Our economically priced drop boxes are well insulated and made of 12 ga. 304 stainless steel for durability and corrosion resistance. We keep 1 1/2 cubic foot boxes in stock, other sizes can be built to order. We can custom build, modify, or Teflon coat your drop box to meet your specific needs.