Check out Pizzato's new E6 Buzzer series from their EROUND product line - There are versions available in IP67 and IP69K with a volume range of up to 80 decibels without holes and IP40 versions that can reach 90 decibels with holes.
• Buzzer totally integrated in a monolithic body of reduced dimensions
• Protection degree up to IP67 and IP69K
• Continuous and pulsing sound versions
• High sound intensity
Designed for use in even the more severe conditions, these devices pass the immersion test IP67 according to IEC 60529. They can be used in all environments that require the highest protection degree of the enclosure. Moreover, special adaptations allow the devices to be used in machineries subjected to intense washing with high pressure and high temperature water jets. In fact they have passed also the IP69K test according to ISO 20653
with water jets at 100 atmosphere and temperature up to 80°C.