An air suspension assembly comprising: a top disposed on a center axis, a piston disposed on said center axis spaced from said top, a bellows of an elastomeric material extending about said center axis between a first end secured to said top and a second end secured to said piston connecting said top and said piston defining a first chamber extending between said top and said piston and said bellows, said piston including an upper portion defining a bore disposed on said center axis extending in gas communication with said first chamber, said piston further including a body extending outwardly from said upper portion and about said center axis to a proximal end defining a second chamber extending between said body and said upper portion, a decoupler disposed in said bore of said upper portion attached to said piston and disposed in gas communication with said first chamber and said second chamber, and said decoupler including a partition member extending transversely across said decoupler isolating said first chamber from said second chamber and defining a first volume (V 1) for said first chamber between said partition member and said top and said piston and said bellows and a second volume (V 2) for said second chamber between said partition member and said body for changing pressure in said first chamber and said second chamber by varying said first volume (V 1) and said second volume (V 2) in response to a pressure applied to the air suspension assembly, characterized in that said decoupler further includes a cap portion defining a hole disposed on said center axis and in said bore and an extension portion of tubular shape disposed in said second chamber and extending annularly outwardly from said cap portion to a distal end defining a third chamber in gas communication with said hole and said first chamber and said second chamber to receive said partition member, wherein the hole and the bore are axially overlapping with each other. a top disposed on a center axis, a piston disposed on said center axis spaced from said top, a bellows of an elastomeric material extending about said center axis between a first end secured to said top and a second end secured to said piston connecting said top and said piston defining a first chamber extending between said top and said piston and said bellows, said piston including an upper portion defining a bore disposed on said center axis extending in gas communication with said first chamber, said piston further including a body extending outwardly from said upper portion and about said center axis to a proximal end defining a second chamber extending between said body and said upper portion, a decoupler disposed in said bore of said upper portion attached to said piston and disposed in gas communication with said first chamber and said second chamber, and said decoupler including a partition member extending transversely across said decoupler isolating said first chamber from said second chamber and defining a first volume (V 1) for said first chamber between said partition member and said top and said piston and said bellows and a second volume (V 2) for said second chamber between said partition member and said body for changing pressure in said first chamber and said second chamber by varying said first volume (V 1) and said second volume (V 2) in response to a pressure applied to the air suspension assembly, characterized in that said decoupler further includes a cap portion defining a hole disposed on said center axis and in said bore and an extension portion of tubular shape disposed in said second chamber and extending annularly outwardly from said cap portion to a distal end defining a third chamber in gas communication with said hole and said first chamber and said second chamber to receive said partition member, wherein the hole and the bore are axially overlapping with each other.