2017 T@B 320S Freshwater Drain Valve Replcement

The knob on the freshwater drain valve (next to entry step on passenger side) is getting hard to open and close. I am worried that the extra strain might break the PEX pipe near the connection. Does anyone know offhand what size replacement valve fitting is needed?   Thanks!
Downers Grove, IL
2017 T@B S Max, Blue and Silver -- "The Blueb@rry"
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