If the handle is still hard to pull open after properly emptying the tank a couple of times, I would take it back to the dealer. The valve is a simple device made out of plastic components sandwiched together with an O-ring and it could be defective, or the assembly screws are to tight. There are also RV lubricants that can be added to the RV tanks that are designed for these valves as well.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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