Spicer Single Drive Axles Service Manual: S135L, S135N, S135S, S150L, S150N, S150S - Manual (Page 30)

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Housing Breather
Install New Axle Housing Breather - (Metal and Plastic)
Dana uses an axle housing breather that consists of a fitting,
hose, and clamp assembly. This breather design has
improved resistance to water ingestion, and clogging caused
by dirt, ice, or snow buildup around the base of the breather.
See installation instructions below (all views from rear).
1. Install fitting in breather hole.
2. Tighten fitting finger tight.
3. Using a 3/4" wrench:
Metal only: Rotate the fitting at least 1/2 turn until
nipple points to rear.
Plastic only: Tighten until one thread is showing.
4. Insert hose onto fitting, long end down.
5. Push hose firmly against fitting. Rotate hose to point
down.