SeaFlo 21 Series Automatic Demand Diaphragm Pump

SKU: 800-03304

As Australia's quietest 12V caravan water pump and carrying a 3 year manufacturing warranty, It's no surprise the RV Supreme from SeaFlo is quickly becoming the pump of choice for Australia's largest and leading RV/Caravan Manufacturers.

Kit Features

  • Compact design
  • Corrosion resistant valves
  • Quiet operation
  • Self-priming
  • Runs dry without damage
  • Low power draw (6 Amps Max Draw)
  • Santoprene diaphragm
  • On-demand pressure switch
  • Adjustable pressure setting
  • Industry standard mounting pattern (easy to retrofit)
  • 18 AWG, 13" long Leads
  • Capable of supplying 1-2 fixtures
CaravanMods Notes!
  • The 21 Series Pump from SeaFlo has a compact design and can be utilised for a wide range of applications including:
    • Liquid transfer
    • Spraying
    • Circulation
    • Filtration
    • Dispensing
  • 21 Series diaphragm pumps are manufactured for extreme conditions.
  • The pump head and components require minimal labour to replace.
  • They provide up to 1.2 gallons per minute, can run dry and has a built-in pressure switch to automatically start and stop the pump when faucet is opened and closed.


  • 12V Operation
  • 3GPM or 9.5LPM 
  • 55 PSI Cut off
  • Max. recommended temperature: 43 °C
  • Max. priming capabilities: 1.2m suction lift
  • Inlet/outlet Ports: 3/8" hose barb (Custom O-Ring Outlets available)
  • Weight: 0.57kg
  • Shipping Weight: 0.8kg
  • 3 Year Warranty


Handling/Dispatch Time

Products in stock are dispatched the same day, if the order is received before 12-noon.

On the product page for every product, you will find a tag which explicitly states the product's stock status. The possible tags are;

  • "In stock Now";
  • "In stock at supplier"; or
  • "Back order"

In stock items: Where an item is in stock it is shipped the same business day provided the order is placed before 12-noon. Orders placed after 12-noon will be shipped out the following business day.

In stock at Supplier: These items will leave our warehouse within the estimated time stated, the stock is ordered from our supplier and then dispatched from our warehouse once it arrives with us. If there is a known delay longer than the time estimated you will be contacted very shortly after your order has been received and will always have the option of a full refund or to wait the estimated period.

Back order: Items tagged as on 'back order' are available for purchase to ensure customer's are able to secure stock for when it does become available. If you need an estimated time frame prior to purchase, please contact us directly! 

Shipping time

All shipping costs are calculated at the checkout and available for review before payment. 

Most standard items ship via Australia Post's eParcel or Letter System. Oversize items are typically sent using Direct Freight Express.

Below are the estimated time frames taken from each carrier's website and also a link to their delivery time frame calculator tool for a more personalised estimate.

To help understand your estimate, our warehouse is located 40kms from the Sydney CBD in Ingleburn (2565).

Australia Post's Transit Time


For Australia Post transit time, please use the below calculator. Our dispatch postcode is 2565 Ingleburn, NSW

Transit Time Calculator:

Direct Freight Express

For oversized items shipped via Direct Freight Express please use the transit time calculator available. Your parcel is dispatched from Ingleburn, 2565 NSW here: