Pre-dive Vacuum Pump System for Salted Line Underwater Housings


Vacuum Pumps and Vacuum Valves are the best photographers’ friends when it comes to checking your underwater housing water tightness and making sure there are no air leaks in your housing before you submerge.

Comparable housings:

  • Salted Line underwater housing for Sony a6000, a6100, a6300, a6400 and a6500 camersas
  • Salted Line underwater housing for Sony RX100 m3, m4, m5, m6 and m7 cameras

Seafrogs Vacuum Pump Systems (VPS) include the following 3 main elements:

  1. a one-way vacuum valve
  2. LED green/red light indicators
  3. A hand pump 

The one-way valve (pic. 1) is designed to be conected to the dedicated accessory port in a housing and let the air out of the housing without letting any air in, measure the inside pressure and give light indication with built-in LED indicator to signal when the vacuum is reached and there is no air left inside.

Seafrogs vacuum valve front view  Seafrogs vacuum valve side view Pic. 1

Another element of the VPS is the hand pump, is usually a quite small but effective tool that connects to the valve port through a soft rubber end-cap and helps to pump the air out of the housing (Pic. 2)

Seafrogs hand pump  Pic. 2


How to use the Vacuum Pump System?

Before inserting the camera into a housing, we recommend going through the overall housing check to ensure all parts and elements are properly greased and ready for the seal and water tightness:

  • Check the Port O-Ring and the tightness of the bayonet connection
  • Check the Pistol Grip cover lid and its O-Ring for tightness
  • Check the Housing O-Rings and make sure there is no sand, hair or other debris around the O-Ring

- Insert the camera inside underwater camera housing in a dry and low humidity place.

- Remove the lid from 10mm accessory port on the top of the back plate, make sure the black color O-ring stays in place to seal the upcoming VPS valve:

Openning a lid of Seafrogs Salted Line 10mm accessory port

- Check that your valve port mount location is clear and free of debris, attach the electronic valve into accessory port by threading it in clockwise until it sits there properly:

Thread in the vacuum valve iinto 10mm accessory port

- Unscrew the electronic valve lid and you will see the metal valve button inside:

Take the cap off the vacuum valve

- Press the metal button inside the valve to turn the LED indicator ON. LED starts blinking RED:

Push the metal button inside the valve  LED indicator starts blinking RED

- Attach the soft rubber end of the Pump to the valve, keep the Pump in vertical position and start pumping the air out until the RED color LED changes to GREEN. LED blinking RED indicates there is still ambient atmospheric pressure inside the housing:

Attach the hand pump and start pumping

- On average it may take around 15-30 pumps until the LED changes from RED to GREEN indicating that the vacuum inside the housing has been achieved (*). We recommend keep pumping for another 2-3 strokes after the LED turned GREEN to make sure there is sufficient pressure inside the housing for the housing seal test.

- Remove the Pump and place the protective lid back to ensure airtightness:

Remove the hand pump  LED indicator blinking GREEN

- Observe the green LED blinking for 15 minutes to make sure there is no air leakage.

- If LED stays GREEN after 15 min it confirms that your housing is properly sealed and there is no air leakage.

You can remove the VPS (**) and get ready for the dive.

In case the green LED turns RED again within the first 15 min, there might be an air leakage somewhere in the housing and we recommend doing another round of housing check before trying again with the Vacuum Pump System setup steps 1 – 10 described above:

  • Check the Port O-Ring and the tightness of the bayonet connection
  • Check the Pistol Grip cover lid and its O-Ring for tightness
  • Check the Housing O-Rings and make sure there is no sand, hair or other debris around the O-Ring 

How to remove VPS and open the Seafrogs Salted Line housing:

  1. Remove the protective lid from the electronic valve (see point 5 above)
  2. Press the button to release the air pressure from the valve (see point 6 above). LED starts blinking red. Note, it is not possible to open the housing back panel prior to the vacuum release.
  3. Remove the electronic valve from the housing back plate and put the cover lid back in place
  4. Now you can open the housing and take the camera out. Please note, there might be some left-over pressure and O-ring seal still in the housing that keeps the back plate "glued" to the housing. You may need to apply some gentle force to open the back plate.

Compatible with:

  • Seafrogs Salted Line Underwater Housings (10mm accessory port)

What is in the box? 

  • Electronic valve with build-in LED light indicators
  • Hand Pump
  • Screwdriver (for battery replacement)
  • Spare O-Rings
  • Optional: additional vacuum valve interface to 14mm and 16mm accessories ports (may work with UW housings from other manufacturers)
  • Where allowed by air transportation regulations, we do include the spare CR2032 battery for the valve, otherwise the spare battery is not supplied, only the battery built-in in the valve is included

Here is the link to our YouTube tutorial video on "How to use the Vacuum Pump System with Seafrogs Salted LIne undewrwater Housing":


    (*) For the sake of simplicity, let’s agree not to engage in the science of physics around the rarefied air and oxygen particles, we will assume a binary situation in this review: either there is air inside, or there is no air.

    (**) Seafrogs manufacturer does not recommend diving with the VPS installed, although our Salted Line team has been diving with the VPS occasionally and there were no issues. One of the major benefits of diving with VPS is absolutely no risk of fogging since there is no air to generate the fog, but such practice remains experimental and might be performed at your own risk.

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