Comparison : Item # JNL0-0375H, JNL Series Internal Connector, Seals 0.375" I.D., 1000 PSI
Item # JNL0-0500H, JNL Series Internal Connector, Seals 0.500" I.D., 1000 PSI
Item # JNL1-0590, JNL Series Internal Connector, Seals 0.590" I.D., 1000 PSI
Item # JNL1-0625, JNL Series Internal Connector, Seals 0.625" I.D., 1000 PSI
Item # JNL1-0750, JNL Series Internal Connector, Seals 0.750" I.D., 1000 PSI