Abstract: Needle assemblies are disclosed. In some embodiments, the needle assembly includes a main housing including an obturator insertion opening and an opposite needle connection opening, a connector housing configured to engage the main housing, the connector housing including obturator, tubing, and plug openings, a self-sealing plug including a channel, the plug positioned within the connector housing so the channel is aligned with the tubing opening, a needle holder base, and a needle. The connector housing is configured to engage the main housing in first and second positions. The obturator opening is axially aligned with the obturator insertion opening and axially aligned with the needle in the first position. The tubing opening is axially aligned with the obturator insertion opening and in fluid connection with the needle in the second position.