An assembly for sealing an interface between a conduit and a case in an aircraft, the assembly comprising: a boot (16; 216) comprising: a tube (18; 218) with first and second ends; and a rubber flange (20; 220) extending generally radially outward from the first end of the tube (18; 218), wherein the rubber flange (20; 220) comprises an opening (22; 222) passing through a portion of the rubber flange (20; 220), wherein the rubber flange (20; 220) comprises a first major face and a second major face; a bushing (24; 224) disposed in the rubber flange (20; 220), the bushing (24; 224) comprising: a tubular body (28; 228) disposed in the opening (22; 222) of the rubber flange (20; 220); a channel (30; 230) extending through a center of the tubular body (28; 228); and at least one lip (32; 32A, 32B; 232) extending radially outward from the tubular body (28; 228), wherein the lip (32; 32A, 32B; 232) is generally flat, wherein the lip (32; 32A, 32B; 232) is in contact and engages with the rubber flange (20; 220) so as to compress the rubber flange (20; 220) against the case; at least one slot (26; 26A, 26B; 226) disposed in a portion of the rubber flange (20; 220); and a fastener extending through the channel (30; 230), through the opening (22; 222), and engageable with a portion of the case so as to apply a force to the bushing (24; 224) thereby compressing the rubber flange (20; 220) with the lip (32; 32A, 32B; 232) of the bushing, (24; 224) wherein the at least one lip (32; 32A, 32B; 232) is seated in the at least one slot (26; 26A, 26B; 226). a boot (16; 216) comprising: a tube (18; 218) with first and second ends; and a rubber flange (20; 220) extending generally radially outward from the first end of the tube (18; 218), wherein the rubber flange (20; 220) comprises an opening (22; 222) passing through a portion of the rubber flange (20; 220), wherein the rubber flange (20; 220) comprises a first major face and a second major face; a tube (18; 218) with first and second ends; and a rubber flange (20; 220) extending generally radially outward from the first end of the tube (18; 218), wherein the rubber flange (20; 220) comprises an opening (22; 222) passing through a portion of the rubber flange (20; 220), wherein the rubber flange (20; 220) comprises a first major face and a second major face; a bushing (24; 224) disposed in the rubber flange (20; 220), the bushing (24; 224) comprising: a tubular body (28; 228) disposed in the opening (22; 222) of the rubber flange (20; 220); a channel (30; 230) extending through a center of the tubular body (28; 228); and at least one lip (32; 32A, 32B; 232) extending radially outward from the tubular body (28; 228), wherein the lip (32; 32A, 32B; 232) is generally flat, wherein the lip (32; 32A, 32B; 232) is in contact and engages with the rubber flange (20; 220) so as to compress the rubber flange (20; 220) against the case; a tubular body (28; 228) disposed in the opening (22; 222) of the rubber flange (20; 220); a channel (30; 230) extending through a center of the tubular body (28; 228); and at least one lip (32; 32A, 32B; 232) extending radially outward from the tubular body (28; 228), wherein the lip (32; 32A, 32B; 232) is generally flat, wherein the lip (32; 32A, 32B; 232) is in contact and engages with the rubber flange (20; 220) so as to compress the rubber flange (20; 220) against the case; at least one slot (26; 26A, 26B; 226) disposed in a portion of the rubber flange (20; 220); and a fastener extending through the channel (30; 230), through the opening (22; 222), and engageable with a portion of the case so as to apply a force to the bushing (24; 224) thereby compressing the rubber flange (20; 220) with the lip (32; 32A, 32B; 232) of the bushing, (24; 224) wherein the at least one lip (32; 32A, 32B; 232) is seated in the at least one slot (26; 26A, 26B; 226).