I guess it depends on how aggressive you want to be. I used some flexable rubber tape that is removable later on down the road. Works great.
Found it at Home Depot in the super glue section. Its designed for pipes - you strech and wrap - sticks to its self great. And since this is not a pressurized line and its outside it might be worth a shot. I would never take a short cut on a pressured line inside the RV.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor