Which pump is suitable for shower on RV?

Show sump pump: Shower sump systems deliver the performance you've been asking for. Standard Box size that offers fast water flow into and out of sump. The lid snaps in to allow quick installation (and removal for cleaning) and includes a gasket to seal the sump box against overflow. The sump box even includes an air to prevent air locks.

Model HY-304553R/HY-304554R: 115v/220v water pump:Max 3.0 Gallons Per Minute capacity flow,and 55 PSI pressure.This series pump can be used for general water transfer,sprayer pumps,small rain system,or other industry usage(perfect for water heater shower,caravans,RV,knapsack sprayer),use it with fresh or salt water or other liquid with weak acid&alkaline is ok.

Model HY-304553R/HY-304554R: 115v/220v water pump:Max 3.0 Gallons Per Minute capacity flow,and 55 PSI pressure.This series pump can be used for general water transfer,sprayer pumps,small rain system,or other industry usage(perfect for water heater shower,caravans,RV,knapsack sprayer),use it with fresh or salt water or other liquid with weak acid&alkaline is ok.

Model HY-304551R: 12v/24v water pump:Max 3.0 Gallons Per Minute capacity flow,and 55 PSI pressure.This series pump can be used for general water transfer,sprayer pumps,small rain system,or other industry usage(perfect for water heater shower,caravans,RV,knapsack sprayer),use it with fresh or salt water or other liquid with weak acid&alkaline is ok.