(81)connects metric with RS parallel threads RS parallel thread ends are typically used with a gasket having a bonded elastomer seal. RP-type gaskets may also be used./Asset/Male-ElbowLMMA.jpg
(63)connects fractional tube to female NPT thread Alternative O-ring materials are available, including silicone, and
Buna-N./Asset/45-Male-Elbow-LMF_primary.JPG