Assortment box of 30 John Guest® pneumatic couplings. Mix of metric and imperial thread adaptors. One of a comprehensive range of high quality components for the John Guest John Guest® Pneumatic Coupling System. Metric and Imperial John Guest® pneumatic couplings assortment. Mix of thread adaptors. Quantity: 30. Supplied in a partitioned box. Contents (Approximate Quantity): Metric & Imperial Thread Adaptors; 6mm x 1/4"" (x5), 8mm x 1/4"" (x3), 8mm x 3/8"" (x5), 10mm x 1/4"" (x5), Brass SuperThread Adaptors; 6mm x 1/8"" (x3), 8mm x 1/8"" (x3), 8mm x 1/4"" (x3), 12mm x 3/8"" (x3).