It says funnel top but the top looks like about a 3" straight opening. Is the picture accurate and the description off??

Hi, you are correct, this sprayer has a 3-inch mouth opening. Thank you for you question and bringing this to our attention. If we can help with any other questions, please feel free to give our technical Customer Service Team a call at 800-950-4458 and they will be happy to assist you. We appreciate your interest in Chapin Sprayers.