SFS FI-R-20 Telescopic Tube Washer are a sleeve for isoweld® field fastening, and side lap fastening applications of waterproof membrane and insulation securement used on conjunction with various metal stress plates (washers) including: FI-P-16,0 _ BSA-P-50 _ BSA-P-70×70. And is alo used for securing the Protan Grip Streel Bar when terminating internal changes of angle where there is insulation in combination with fasteners: BS-4.8 _ BS-S-4.8 _ TS-T25-6.0 _ TI-T25-6.3 _ TI-S-T25-6.3 _ TIA T25-6.3

SFS FI-R-20 are a high capacity membrane Telescopic Tube Washer for securing all thicknesses of Protan SE membrane. To be used in conjunction with BS-4.8 / TS-T25-6.0 screws. Compatible with all approved insulation types.