This bulkhead connector is from the Norgren 16 Series of BSP and hose fittings. The fitting is manufactured from nickel plated brass. Suitable for use with compressed air. * External thread size M28 x 1.5 * Internal thread size G1/2 * Supplied with high temperature and pressure copper washers https://elecena.pl/product/27735654/norgren-160290048-metric-iso-g-bulkhead-coupling-m28-x-1-5-ext-g1-2-int 2025-01-22 https://elecena.pl/product/27735654/norgren-160290048-metric-iso-g-bulkhead-coupling-m28-x-1-5-ext-g1-2-int 2026-07-07