https://www.youtube.com/watch?v=hFW0Wryn3Ns10" Stainless Steel Float Switch can be used in temperatures from -30ºC to 150ºC and can function in pressures up to 1MPa. This float switch threaded end is about 3/4" long. It can detect liquid levels and can be mounted using a fastener as described in the manual at the link below.  

video 

Specification: 

• Product Name: Stainless float ball switch
• Switch Type: Knob switch 
• Features: Water Level Sensor 
• Material: Stainless Steel 
• Item Type: Switches 
• Max Switch Voltage: 220V
• Max Contact Rating: 50W
• Temperature rating: -20 to 160 
• Power Input: 110/220V 0.5/1A 10/50W 
• Protection Ratings: IP68 
• Pressure rating: <=1.5 Mpa 

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Packages Include:

1 x 10" Stainless Steel Float Switch 110/220V