Note: Some water inside is normal as all items were tested before shipped out. [SELF PRIMING]: Self-priming function allows it to be mounted above water tank, able to run dry. [Safety and Duable Enough] Self Priming RV AC Washdown Pump can run dry for a short time, reducing the risk of motor burnout. Super power-saving (36 Watts, DC 12V/only 3A) but good performance (4.5L/Min, 110 PSI). Please don't worry. 2 tube clamps sent for free. Buy YOUNGTREE Water Diaphrag Pup 12 Volt DC 3.5 GP 45PSI, On Deand Self-priing Water Pup Tips: The adpater at least 12V 8A Anbull 12V RV Water Transfer Pump, 4.0GPM/50PSI Fresh Safety and Duable Enough] Self Priming RV AC Washdown Pump can run dry for a short time, reducing the risk of motor burnout. The thermal overload protection function of the motor makes our products safer and more durable Aazon.co: Water Diaphrag Pup 12 Volt DC 4.0 GP 50PSI, On Deand Self-priing Water Pup for... Brand TDRFORCE Color Black Style Diaphragm Pump Power Source Ac/dc Item Weight 1.32 Pounds Maximum Flow Rate 1.2 Gallons Per Minute About this item [GOOD PERFORMANCE & LOW POWER CONSUMPTION]: This diaphragm pump delivers smooth & consistent flow at all ranges of operation, while drawing low current.