  During the last decade experimental evidence is building that the mass
supertransport through solid Helium-4 as well as the anomalously large matter
accumulation in the bulk -- the giant isochoric compressibility (aka the
syringe effect) -- are both supported by a network of dislocations with
superfluid core. However, a structure of this network as well as its relation
to the basal (non-superfluid) dislocations which are responsible for plasticity
remain unclear. Here it is shown that superclimbing and basal edge dislocations
can form bound pairs. This implies that plastic deformation should produce the
syringe effect and vice versa. The experimental test is proposed. While the
strength of the effect depends on the average orientation of the paired
dislocations, there is a feature unique for the superfluid dislocation scenario
-- the supercurrents flow in the direction perpendicular to the plastic
deformation.
