Identify which dimension you are reading
Hose inside diameter describes the air passage through the hose. The inlet connection describes how a fitting joins to the tool. These specifications are not interchangeable. A small-looking inlet label is not a recommendation to choose a hose with the same nominal diameter.
Record the tool’s stated minimum hose inside diameter and keep the inlet’s thread description separately. If the source gives only a nominal inlet dimension without a thread standard, the catalog cannot confirm which connector will fit. Do not infer that detail from a photograph.
Use the selected model’s requirement
Ingersoll Rand’s troubleshooting guidance directs users to check the specifications for the individual tool; hose requirements should not be chosen from drive size alone. Its model-specific 2922 setup instructions also distinguish the inlet fitting from the minimum hose inside diameter.
For an illustrative comparison, a tool requiring at least 3/8-inch hose does not meet that stated minimum with a 1/4-inch inside-diameter hose. A 3/8-inch hose meets the diameter check, but that single result does not verify the entire installation. The checker should say precisely which requirement was evaluated.
Follow the complete route to the tool
List the hose length, reel, couplers, adapters, regulator and any filters in the air path. Porter-Cable identifies hose diameter, length and flow rate as factors in pressure loss under flow. A diameter-only check cannot estimate the loss through an unspecified collection of components.
When the verified tool record has no minimum hose size, the useful result is “not published in the checked source,” with a link to the manual. Obtain that requirement before purchasing a hose. A pressure reading with no air moving also cannot establish the pressure available while the tool works.
A matching connector does not prove that the complete air line can supply the tool. Check the exact model’s hose requirements.