1/8" BSP thread, 4 x 1.5 mm holes. The tapered machining used to cut the threads on these tips does not allow for any gasket or o-ring to be used, and they seal with mechanical force only.
Also available: 1.2 mm 4 hole tip.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.