R1CU REFERENCE MOUTH BARREL LENGTH RUBBER STANDARD R-1, R-1C 19.3 mm 18.7 mm 291 mm FDA, JETRO

B1U-LT REFERENCE MOUTH BARREL LENGTH RUBBER STANDARD R-1C, R-1D 20.0 mm 19.1 mm 293 mm FDA

TLC-B1 REFERENCE MOUTH BARREL LENGTH RUBBER STANDARD R-1, R-1C 19.6 mm ---- 295 mm FDA, JETRO

TLC-B2 REFERENCE MOUTH BARREL LENGTH RUBBER STANDARD R-2CV 19.4 mm (3rd ring) ---- ---- FDA, JETRO

TLC-B3 REFERENCE MOUTH BARREL LENGTH RUBBER STANDARD FLO-STAR 19.8 mm (3rd ring) ---- ---- FDA, JETRO