Water Level Sensor Module 2PCS Rain Water Level Liquid Surface Height Depth Detection Sensor Module for Arduino Raspberry Pi electronics3 you can install the o-rings

you can install the o-rings as needed

Duck Max Strength 240866 Duct Tape

can be used for long time

press the connector clamp into the tube with thumb

They have good electrical resistance

Water Level Sensor Module 2PCS Rain Water Level Liquid Surface Height Depth Detection Sensor Module for Arduino Raspberry Pi electronics3 you can install the o-ringsWater Level Sensor Module 2PCS Rain Water Level Liquid Surface Height Depth Detection Sensor Module for Arduino Raspberry Pi Specifications: Product Name: Water Level Sensor Working Voltage: DC3 5V Working Current: less than 20mA Sensor Type: Analog Detection Area: 40x16mm 1. 57x0. 63Inch Processing Technology: FR4 double sided tin spray Working Temperature: 10 30 Degree Centigrade Working Humidity: 10% 90% non condensing Size: 62x20x8mm 2. 44x0.