an obturator device for a pressurized hydraulic damper tube of the single tube type in which slides a piston having an axial piston rod . the obturator device includes a plug , a seal , a fixing mechanism and a cylindrical guide whose central opening guides axial movement of the piston rod . the guide has a guide base and an axial peripheral wall defining a circular housing for supporting and centering the seal and the plug . the seal and plug can be fully received with the circular housing in one embodiment of the invention . the base has a plurality of perforations arranged along a circular path positioned at the bottom of an annular groove formed in the base &# 39 ; s upper side . the plug has a central opening whose diameter is greater than the diameter of the piston rod of the tube to define a radial clearance preventing mechanical contact between the plug and the piston rod during operation of the damper . the plug also has a circular housing around its central opening to receive part of the seal sandwiched between the plug and guide device .