5. T.H.D. ( Teflon, Heavy Duty) 6. K.H.D. ( Kynar, Heavy Duty) 7. S.T.H.D. ( Sanitary, Teflon, Heavy Duty) 8. T.C.T. ( Teflon, Concentric Tube) 9. Dual Probes 10.T.F./ K.F. ( ....