Breather valve

Hi lads is the breather valve on the e39 525i the same as the crankcase breather filter ? http://www.micksgarage.com/search.aspx?fffDepartment=Crankcase%20Breather%20F ilters&fffMake=bmw&fffBasemodel=bmw%205-series&fffModelDescription=5%201995%20to%202003&ffftd_car=525%20i&fffBHP=192

I'm doing an overhaul on the engine oil seals and rocker cover gasket

Yep that's the one, get all four breather hoses too as they are usually very brittle and can snap easily when taking them off.