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Non-metal annular space seals for over ground and underground working in the fields of pipeline and building construction, electrical and water conduits and air conditioning ducts; non-metal annular space seals for pipeline construction and for water, gas and power supply companies for sealing wall, ceiling or floor leadthrough passages for supply of disposal pipes as well as for sealing the annular space between the separation medium and protection pipes of pipe-in-pipe systems and parts of such seals; non-metal modular seals for walls and floors; molded parts of rubber, synthetic rubber, silicone rubber and other elastomers, namely, insulators, insulator boots, insulator nipples, insulator strain relief, insulator caps, insulator plugs; bonded insulators, isolators for forming seals; non-metal cap seals for use in annular space seals; non-metal plug seals for use in annular space seals for sealing the annular space between the separation medium and a pipe extending through a hole in the separation medium; rubber valve seals for use in annular space seals for sealing the annular space between the separation medium and a pipe extending through a hole in the separation medium; non-metal vacuum air seals for use in annular space seals for sealing the annular space between the separation medium and a pipe extending through a hole in the separation medium; non-metal gasket seals for use in forming seals for isolating two sides of a separation medium; non-metal bonded seals for sealing the annular space between the separation medium and a pipe extending through a hole in the separation medium; non-metal cover seals for sealing the annular space between the separation medium and a pipe extending through a hole in the medium; non-metal diaphragm seals for sealing the annular space between the separation medium and a pipe extending through a hole in the separation medium; vacuum connector blocks for use in forming seals for isolating two sides of a separation medium; rubber grommets for use in forming seals for isolating two sides of a wall; small bumpers made of rubber; cushion rolls made of rubber or plastic in the nature of stuffing for forming seals in walls, floors and ceilings; tube and pipe supports made of rubber for use in forming seals as isolation members