SealBoss 13mm x 60mm (1/2″ diameter x 2.75″ length) steel mechanical packers for high pressure chemical injection applications. Compatible with 13mm (1/2″) diameter drill holes. The standard fitting is a standard zerk style fitting that is included in the price. Steel packers allow for port-to-port functionality in which the zerk fitting can be left out of the packer until material is observed exiting the port. Button head style zerks also available for this packer.