The SKC Luers fit 1/4" inner diameter tubing.
The tapered end of the Luer can be locked into a GilAir plus sampling pump exhaust port for direct injection into a tedlar bag during the helium leak test for soil vapour/sub-slab programs.
The SKC Luers are also commonly used for connecting sample media. The tapered end of the luer slides into sampling cassettes for mould, lead, etc. and connected to a sampling pump for area or personal industrial hygiene sampling programs.