Price:

Cool water causes air in diff to contract, 'sucking' in whatever is near the breather

Water, Mud, Dust, Nuclear Waste, Fish Guts, Wee

This kit has:
1 x Integrated Manifold Bracket - Billet Alloy
4 x Push Fit Fittings
2 x Filters
1 x Length of Industrial Semi Rigid Nylon Tube
Cable Ties

CNC Machined Billet Alloy Integrated Manifold Bracket

Filters Mount on Firewall or in Extreme Conditions On roll bars for RACE LOOK

These special filters Exclude Moisture & Crud

Alloy part is Designed, machined, anodised, packaged in Australia

NOTE:
Beware of cheap nasty kits with ugly fuel filters or no filters and no mounting bracket
Also, watch out for soft household tube which will kink at the slightest touch or perish when oil, fuel or exhaust gas gets on it

Update on homemade diff breathers - They look so tacky that you will be embarrassed to pop the hood, so you may not check you oil and other fluids often enough, causing problems associated with neglected maintenance