Surge guard 50 Amp surge protector by TRC Portable. Perfect for pop-ups and travel trailers. Identifies faulty park power plus offers surge protection. Analyzes circuits to verify pedestal power. Tests for and indicates: open ground, open neutral and correct polarity. Illuminated power status indicators. 4,200 Joules of power surge protection. Easy-T-Pull handles. Weather resistant. Portable Surge Guards are power protection adapters that plug directly between the power pedestal and your line cord. Protects RV from faulty park power. Provides surge and additional electrical protection.