spontaneous unaffectedDN15 1/2" Automatic Float Valve Water Level Control For Aquarium Humidifier Suitable for aquarium, water tank, humidifier, ice maker, water supply equipments etc. Non-toxic, tasteless, and can be used for drinking water. Connection: 1/2" DN15. Valve body material: ABS plastic. Ball material: PE. Working temperature: -30 - +70. Working Water Pressure: 0.02 - 1.0 Mpa. Size: 7cm x 7cm x 3.8cm.