Fuel sump tester mount for 4 inch tube testers.  Version 2 now accepts both the phillips and standard tips.   6 inches is the total length of the tester from phillips head to the top.   Recommended to be mounted with 3M Dual Lock.   The price is for one mount.   Material is UV resistant.
 
works with these:
https://www.aircraftspruce.com/pages/ps/fueltesters/shortfuel.php
https://www.aircraftspruce.com/pages/ps/fueltesters/gasoholTester.php