SEAFLO 21 Series 3.8LPM 12V Water Pump
The 21-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing. The 21-series of diaphragm pumps are self-priming and can be run dry without harm. It provides up to 3.8 litres per minute (1.0 GPM). This compact automatic demand water system pump has a built-in pressure switch, which automatically starts and stops the pump when faucet a is opened and closed.
The 21-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing. The 21-series of diaphragm pumps are self-priming and can be run dry without harm. It provides up to 3.8 litres per minute (1.0 GPM). This compact automatic demand water system pump has a built-in pressure switch, which automatically starts and stops the pump when faucet a is opened and closed.
The 21-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing. The 21-series of diaphragm pumps are self-priming and can be run dry without harm. It provides up to 3.8 litres per minute (1.0 GPM). This compact automatic demand water system pump has a built-in pressure switch, which automatically starts and stops the pump when faucet a is opened and closed.
The 21-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing. The 21-series of diaphragm pumps are self-priming and can be run dry without harm. It provides up to 3.8 litres per minute (1.0 GPM). This compact automatic demand water system pump has a built-in pressure switch, which automatically starts and stops the pump when faucet a is opened and closed.
in 33 offers
The lowest price for SEAFLO 21 Series 3.8LPM 12V Water Pump right now is $36.50 at eBay.com.au, compared across 19 retailers.
The all-time low was $30.54 on 6 Mar 2026 — today's price is 20% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 9 June 2026.
Last updated at 09/06/2026 04:48:57
SEAFLO 12V Diaphragm Water Pressure Pump 3.8 LPM 1.0 GPM 40 PSI
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Seaflo 21 Series 12v Water Pump - 3.8 Lpm For Rv, Camper, Caravan, And
Free delivery
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SEAFLO 12V Water Pump 21 Series 3.8 LPM | 3 Year Warranty | RV Camper Trailer Caravan Camping Boat
Free delivery
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SEAFLO 12V Water Pump 21 Series 3.8 LPM - RV Camper Trailer Caravan Camping Boat | 3 Year Warranty
Free delivery
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Seaflo 12v Water Pump 21 Series 3.8 Lpm - Rv Camper Trailer Caravan
Free delivery
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12V Water Pump SEAFLO SFDP1-010-040-21 | SFDP101004021 RV Camper Pressurized Pump Caravan Boat 1 Year Warranty | 12V Water Pressure Pump
Free delivery
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SEAFLO 12V Water Pump 21 Series 3.8 LPM | RV Camper Trailer Caravan Camping Boat | SFDP101004021 | 3 Year
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Seaflo 12v Water Pump 21 Series 3.8lpm For Camper Trailer, Caravan
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Seaflo 12v Water Pump 21 Series 3.8lpm For Camper Trailer, Caravan
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Seaflo 21 Series Diaphragm Pump 12 Volt 4.0 Amp Boat Marine
Delivery $8.95
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originally posted on campsmart.net.au/
Purchased for our van fit out this is the second one we have purchased it excellent little pump we run our shower and sink it has great pressure we pump from the back of the van to the front no problem an It is very quite would recommended this product
originally posted on ebay.com
Small to fit into confined spaces. Different hose fitting sizes , Uber mounted. Great looking product, havent used it yet.
originally posted on ebay.com
It was advertised as silent and it is not silent, but it is not excessively noisy.
| Voltage | 12V |
| Max. Water Temperature | 60°C |
| Volume max. (L/min) | 3.8 L/Min |
| Length (mm) | 183mm |
| Cut Out Pressure Bar | 2.8 |
SEAFLO 12V Diaphragm Water Pressure Pump 3.8 LPM 1.0 GPM 40 PSI
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Seaflo 21 Series 12v Water Pump - 3.8 Lpm For Rv, Camper, Caravan, And
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
SEAFLO 12V Water Pump 21 Series 3.8 LPM | 3 Year Warranty | RV Camper Trailer Caravan Camping Boat
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
SEAFLO 12V Water Pump 21 Series 3.8 LPM - RV Camper Trailer Caravan Camping Boat | 3 Year Warranty
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Seaflo 12v Water Pump 21 Series 3.8 Lpm - Rv Camper Trailer Caravan
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Purchased for our van fit out this is the second one we have purchased it excellent little pump we run our shower and sink it has great pressure we pump from the back of the van to the front no problem an It is very quite would recommended this product
Small to fit into confined spaces. Different hose fitting sizes , Uber mounted. Great looking product, havent used it yet.
It was advertised as silent and it is not silent, but it is not excessively noisy.
It works as expected. A good product. I have 2 other Seaflo products and they all seem to be of high quality.
I have installed this pump in my caravan in place of a hand operated pump. The installation was easy and I followed the instructions supplied. The important point to remember with this design of pump is being a diaphragm type of design you will not have a pump that operates ultra quiet, having said that I made sure the pump was not tightened down tight on its rubber mountings and I also used the most flexible hosing I could find. It is still a bit noisy but my operation of it is for short time use as in filling kettle or addition of cold water to sink. The pump is fitted on the base of caravan floor underneath the sink unit. The delivery from the water storage tank beneath the caravan is excellent. I would suggest this pump is all that is required for cold water ... MoreI have installed this pump in my caravan in place of a hand operated pump. The installation was easy and I followed the instructions supplied. The important point to remember with this design of pump is being a diaphragm type of design you will not have a pump that operates ultra quiet, having said that I made sure the pump was not tightened down tight on its rubber mountings and I also used the most flexible hosing I could find. It is still a bit noisy but my operation of it is for short time use as in filling kettle or addition of cold water to sink. The pump is fitted on the base of caravan floor underneath the sink unit. The delivery from the water storage tank beneath the caravan is excellent. I would suggest this pump is all that is required for cold water supply in a caravan or similar vehicle.
That was good but the only concern was they didn't tell is we need a switch for the compressor, they tell us really sure that the compression would turn off automatic but doesn't
Great pump, does exactly what it needs to do. Has been very smooth so far. Works fine without an accumulator.
Water flow is good however the pump is very noisy. The advertising and information provided quotes the pump is quiet, however, it is very noisy. I have replaced it with a SeaFlo 42 series which is almost silent in comparison.
Great little pump and works extremely well. Very happy.
Just used it for camping at carnarvon gorge. I have a footwell tank and tried a couple of methods of easily getting water from it. The pump has worked perfectly. It shuts off when the tap is closed and starts again when opened as it should. Flow rate is perfect for filling a 5 litre water container. The perfect camping accessory.
| Voltage | 12V |
| Max. Water Temperature | 60°C |
| Volume max. (L/min) | 3.8 L/Min |
| Length (mm) | 183mm |
| Cut Out Pressure Bar | 2.8 |
