These internally expanded, permanent couplings provide full flow of material being conveyed and are commonly used in home fuel oil delivery, marine refueling, tank truck service, or in aviation refueling applications (meets API 1529 for Aviation Fueling). They require special machinery for installation, and are NOT for use with air and are only suitable for rubber hoses with a pliable rubber tube (internal expansion process will crack hard plastic/PVC/poly style tubes). Assemblies used in critical applications must be tested/certified at regular intervals. Female NPSM Scovills are only used for ease of installation. Due to the fact that NPSM thread seals on a gasket and will wear over time, they are not to be used in permanent applications. For permanent applications use an N270- pipe union which offers a mechanical seal.

Detail Comments: Female NPSM scovills are only used for ease of installation. Due to the fact that NPSM thread seals on a gasket will wear over time, they are not to be used in permanent applications. For permanent applications use an N270 pipe union which offers a mechanical seal.