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Our flush joint caps are designed according to F480 specifications for flush joint pipe and fittings. Available in Sch40 and Sch80 and fit all flush joint threads manufactured to this standard.
ASTM F480 - 14 Standard Specification for Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and SCH 80. Complete specifications available for purchase from ASTM.