These breathers use a -16 AN thread to allow the user to install fittings of there hose size choice. The breathers are sold in pairs with a pair of gaskets and RBS carries a full line of fittings to provide the customer with the size AN fitting they may need.
The breather also has an internal baffle. The height of the breather is 4.50" from mounting surface to top of breather.
Fittings are sold separate.