Dominator series air springs — the D2500 and the D2600 -- provide the ultimate in air spring performance with more lift, higher pressure, and a softer ride. The D2500 features a maximum 600 PSI restrained and a 7.7" stroke for increased lift. The D2600 air spring also features a maximum 600 PSI restrained and a 9.7" usable stroke for increased lift. Both the D2500 and D2600 series come with single and dual port options and are the most competitively priced bags of their style in the industry.