We see more people who have the wrong breather hose from rocker cover to the PCV on Heralds and Spitfires than any other.
If you are tired of fumes in the cockpit... and weeping oil from all sorts of strange breather arrangements, go back to the standard set up. It just works !!
"1/2" inch cranked hose GRH900.
Note... the sale is for the Hose and the two Premium Grade Jubliee Clips Only..... Not for the PCV Valve