throughout the circumference membrane 30 is adhered to the tops of flanges 11 by adhesive or by heat sealing as shown membrane 30 is rupturable and serves as a means for releasing the lubricant the membrane 30 may be comprised of any suitable material which will be torn from the flanges 11 or itself be ruptured by contact with the edge or inside surface of an adjoining pipe section when utilizing the seal of fig7 in a pipe joint such as that shown in fig1 above seal 10 is placed in the coupler 4 as shown in fig3 as the pipe 2 and the coupler 4 are joined the inside surface 2a of pipe 2 contacts the membrane 30 and either tears the membrane to release lubricant or disengages the membrane 30 from flange 11 to release the lubricant it will be apparent to one skilled in the art that the lubricant containing reservoir could be a sponge like or porous material rather than a cavity as shown also other suitable means to release the lubricant from the cavity could be utilized in this seal as is readily apparent by the above description the pressure responsive seal described above may be utilized with various type joint structures for example pipes 2 and 3 could comprise female members on their in sections which are inserted onto a male type coupler such a structure would comprise two seals in a manner similar to the embodiment shown in fig1 with the seals mounted in channels in either the pipe.