The main line that carries compressed air from the pump head to the air tank, the discharge (or “transfer”) tube is typically made of copper, aluminum or stainless steel braided material. Be sure all compression fittings and threads have tight seals and don’t leak, and replace if kinked or cracked.
This item fits the following models:
3-Nailer Combo Kit w/ Accessories
3-Nailer Combo Kit
1/4" x 50 Ft Noodle Air Hose with Coupler and Plug