hd series vs titanium or other?

what are the differences is the HD series and the titanium series? is the HD basically the like the older style?

Mudn_1 said:

what are the differences in the HD series and the titanium series? is the HD basically the like the older style?

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The only difference between the HD and Titanium series is physical size of the pump, The filter size and the color.

HD Series = RED
Titanium Series = BLUE

Mudn_1 said:

is the HD basically the like the older style?

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The HD series is our 150 series. We decided to change the part numbers and names to try and ease some of the confusion with our old part numbers.

Do these have adjustable regulators?