Subscribe to America's biggest dictionary and have thousands additional definitions and Sophisticated research—ad cost-free! Manual espresso machines use human pressure to produce the necessary pressure for brewing. The most common kinds are lever-operated through manual pumps, even though other systems exist. Disclaimer: This website page may have affiliate inbound links. https://indoorairqualityimproveme09753.wikikarts.com/671679/not_known_details_about_coffee