Abstract: A bar linkage for a pipe coupling can include a first bar configured to span two end rings of the pipe coupling; a second bar configured to span the two end rings of the pipe coupling; and a single tensioner extending through each of the first bar and the second bar and joining the first bar to the second bar along an axis of the bar linkage in an assembled condition of the bar linkage, the tensioner configured to draw the first bar towards the second bar, the first bar and the second bar able to be angled with respect to each other and with respect to the axis of the pipe coupling in a tightened condition of the pipe coupling when viewing the bar linkage from the top when the pipe coupling couples pipes of unequal diameter.

Abstract: A seal for a pipe coupling can include an outer gasket defining a radially inner surface defining a plurality of grooves; and an inner gasket separably joined to the outer gasket and defining a radially outer surface, the radially outer surface defining a plurality of ridges extending radially outward and including: a first ridge, each of first and second side surfaces of the first ridge angled in cross-section with respect to a radial direction of the inner gasket towards a first axial end of the inner gasket when in an uncompressed state; and a second ridge, each of first and second side surfaces of the second ridge angled in cross-section with respect to the radial direction towards a second axial end of the inner gasket when in the uncompressed state; wherein the radially outer surfaces of the inner and outer gaskets contact each other.

Abstract: A seal for a pipe coupling can include an outer gasket defining a radially inner surface defining a plurality of grooves; and an inner gasket separably joined to the outer gasket and defining a radially outer surface, the radially outer surface defining a plurality of ridges extending radially outward and including: a first ridge, each of first and second side surfaces of the first ridge angled in cross-section with respect to a radial direction of the inner gasket towards a first axial end of the inner gasket when in an uncompressed state; and a second ridge, each of first and second side surfaces of the second ridge angled in cross-section with respect to the radial direction towards a second axial end of the inner gasket when in the uncompressed state; wherein the radially outer surfaces of the inner and outer gaskets contact each other.

Abstract: A seal for a pipe coupling includes an outer gasket defining a radially inner surface defining a plurality of grooves; and an inner gasket separably joined to the outer gasket, a radially outer surface of the inner gasket defining a plurality of ridges, each of the plurality of ridges extending radially outward, the plurality of ridges including: a first ridge, each of first and second side surfaces of the first ridge angled in cross-section with respect to a radial direction of the inner gasket towards a first axial end of the inner gasket; and a second ridge, each of a first and second side surfaces of the second ridge angled in cross-section with respect to a radial direction of the inner gasket towards a second axial end of the inner gasket; wherein the radially outer surface of the inner gasket contacts the radially inner surface of the outer gasket.

Abstract: A seal for a pipe coupling includes an outer gasket defining a radially inner surface defining a plurality of grooves; and an inner gasket separably joined to the outer gasket, a radially outer surface of the inner gasket defining a plurality of ridges, each of the plurality of ridges extending radially outward, the plurality of ridges including: a first ridge, each of first and second side surfaces of the first ridge angled in cross-section with respect to a radial direction of the inner gasket towards a first axial end of the inner gasket; and a second ridge, each of a first and second side surfaces of the second ridge angled in cross-section with respect to a radial direction of the inner gasket towards a second axial end of the inner gasket; wherein the radially outer surface of the inner gasket contacts the radially inner surface of the outer gasket.