PMR | Basic Built-in Frame

Empty, closed by removable membrane
The rectangular built-in Frame, is joined to an EPDM rubber gasket, temporarily closed by a removable sheet.
Its window is suitable to house rectangular GPR cushions with round passages of different diameters.
Round GRR and GRE reductions with GTR round plugs, fit in the passages.
The GPE mechanical expander efforts the final tightening of the system.