Thinning Accessory 2301990

Hello Dee, Thank you for your inquiry. We show that this part is the yellow accessory, we do not show that a grid comes with it. The thinning accessory should be secured vertically to the side of the container. Fill the container with spray material to the bottom of any of the notches on the accessory. Add the appropriate thinning agent. For every notch that the fluid level in the container rises, the spray material is diluted by 10% and it is recommended by the manufacturer that the material be thinned in increments of 10%, but not more that the material manufacturer's recommendations. After the material has been properly thinned and stained, fill the container to the top of the neck. We hope this helps and if you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you!