2nd stage reg
- Thread starter jonkcp
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
I own a MK17 with a G250V and a MK25 with a S600. Replacing the G250HP with an S600 doesn't make sense (unless you want a smaller profile reg) since they both use the same internal parts. The G250V on the other hand uses a metal air barrel (better for cold water use). The MK17 first stage is an excellent cold water reg but if you don't dive in water 40 degrees or colder, the MK25 first stage is an excellent reg too.
Switching from a G250HP to an S600 is actually a step in the wrong direction. The S600 is smaller, but as CMAN points out, it is internally identical. So in effect with the smaller S600 you get a smaller diaphragm that requires a greater pressure differential to operate those identical internal parts and, all other things being equal, it requirs a slightyl higher inhalation effort to operate.
In addition, the G250HP is slightly heavier due to it's larger case and diahragm, but it also displaces more water, so the extra weight is offset by the extra bouyancy in the water and the S600's "less jaw fatigue" argument does not hold water.
The G250V utilizes a metal air barrel that improves both heat transfer and moisture retention, making it a better choice for cold water and for longer dives where dry mouth may otherwise be an issue.
In addition, the G250V represents a return to the older G250 design and it eliminates the excessive complexity, parts count and multiple o-rings used in the adjustment knob of the G250HP and S600. It is a better second stage all the way around.
The Mk 17 is in my opinion the best first stage currently available on the market. It is very reliable, offers more than enough performace for any recreational or technical purpose and is the most bullet proof cold water reg currently available.
In addition, the G250HP is slightly heavier due to it's larger case and diahragm, but it also displaces more water, so the extra weight is offset by the extra bouyancy in the water and the S600's "less jaw fatigue" argument does not hold water.
The G250V utilizes a metal air barrel that improves both heat transfer and moisture retention, making it a better choice for cold water and for longer dives where dry mouth may otherwise be an issue.
In addition, the G250V represents a return to the older G250 design and it eliminates the excessive complexity, parts count and multiple o-rings used in the adjustment knob of the G250HP and S600. It is a better second stage all the way around.
The Mk 17 is in my opinion the best first stage currently available on the market. It is very reliable, offers more than enough performace for any recreational or technical purpose and is the most bullet proof cold water reg currently available.
Dear CMAN & DA Aquamaster,
Thank you for your advice. G250V + Mk17 should be best combo for me. In most of time, I divie in topical water. The reason I select Mk17, I try to avoid the sand get into the 1st reg after coast diving. :blinking:
Thank you
Jon
Thank you for your advice. G250V + Mk17 should be best combo for me. In most of time, I divie in topical water. The reason I select Mk17, I try to avoid the sand get into the 1st reg after coast diving. :blinking:
Thank you
Jon
vicdiver656
Guest
Definitely don't replace the G250HP with an S600. This depends where you are diving, but the G250V flows better at depths and cold water than the S600. Also, if you are going for the M17, I would also suggest the M19 if possible. It is only sold in Europe, but it has one more port than the M17 (same routing design as the MK25)
Similar threads
