Very compact units featuring retained collets and positive tube anchorage. Silicone-free O-ring seals. Non-PTFE based thread sealant on all BSP taper threads. Easy tube insertion for rapid assembly. Internal hexagon on straight adaptors allows assembly in confined spaces. For quick and easy assembly of pneumatic circuits. Reliable and corrosion resistant.10167-04-18: O/Dia Tube 4mm. BSPT Thread R1/8.10167-04-28: O/Dia Tube 4mm. BSPT Thread R1/4.10167-05-18: O/Dia Tube 5mm. BSPT Thread R1/8.10167-06-18: O/Dia Tube 6mm. BSPT Thread R1/8.10167-06-28: O/Dia Tube 6mm. BSPT Thread R1/4.10167-08-18: O/Dia Tube 8mm. BSPT Thread R1/8.10167-10-28: O/Dia Tube 10mm. BSPT Thread R1/4.10167-10-38: O/Dia Tube 10mm. BSPT Thread R3/8.10167-12-28: O/Dia Tube 12mm. BSPT Thread R1/4.10167-12-38: O/Dia Tube 12mm. BSPT Thread R3/8.