Diana 34-54 Apex pistongpacking
Fits 34,36,38,40,45,46,460,470,48,52,54, SM1000, B21-22 etc. Large Nylon seal. Apex brand-Super High Quality.Fits 350 mag and NWS 66 etc. 460 as well.
Late model 24's with 1.260" OD tube and 1.1" ID take this seal. Many are 2003 and above.
More forgiving seal for tighter tubes or tube run out.