How much care are pistons vs. diaphraghms

[DivingDoc]

In comparing the Zeagle flathead VI vs. the ScubaPro, it would seem that they are both good breathing regulators -- with the numbers from ScubaPro looking slightly better than the Zeagle. However, one has a diaphragm first stage and one has a piston. From what I understand, you have to be very careful to thoroughly clean out piston first stages after each dive so that they don't corrode, while diaphragms are environmentally sealed.

Given this, which would you pick for all-purpose recreational diving -- Zeagle flathead VI or ScubaPro MK20, S600?


Elaine

 

[devjr]

Differences in first stage maintenance are immaterial to the merits of the two types of regs and to the specific choices you cited. However, should you be diving in ice or in a coal mine the diaphragm type would be preferable.

There is practically no difference in after dive cleaning. Immediately after removing the reg blow dry the dust cap with compressed air and replace. Wash off the reg inside and out. Do not depress the purge button. If it's a piston reg, see that water is allowed to flood the ports on the first stage. The parts inside are stainless steel but should be cleaned out nevertheless. Either way, ensure that the dust cap under the yoke is down tight. This is especially important with the diaphragm reg because of its many small brass parts.

Should you be on a trip and can't wash off the reg for two weeks, don't worry about it. Neither type will be adversely affected.

The most important factor will be comfort of the second stage, including the mouthpiece, ease of locating and turning the knobs, and bubble dispersion. The really tiny second stages have a reputation for this but you may prefer them anyway due to their lightness and performance. You may prefer the type with the first stage swivel. Check to see if there is any difference in the softness of the LP hoses. A stiff reg hose is uncomfortable.