best piston seal for 34/350 and their "clones" ?

[D14Jeff]

vortek ProSEAL28 .... http://vortekproducts.com/ourstore/Seals-Tuning-Parts?product_id=228

ARH/JM Apex Large Seal ... http://www.airrifleheadquarters.com/catalog/item/251485/43075.htm

ARH/JM Tesla Large Seal ... http://www.airrifleheadquarters.com/catalog/item/251485/834672.htm

what's the differences other than a few bucks that aren't enough to make a difference ? does either install easier ? seal better ? last longer ? other differences ?
is there something better than them ? no laith here to make or resize them . looking for something that'll fit from the get-go .

thanks

[Roadworthy]

Measure your tube or seal diameter.  I think the Diana takes the Apex Small or the New Tesla II.  I've never used a Vortek seal but I do appreciate the Maccari quality and speedy service.

[Blue]

I've got an Apex in a .177 Airhawk and a Tesla in a .22 Blackhawk.  Due to the differences in caliber, I can't offer a direct comparison but I can't feel a difference.  I bought one of each when replacing the seal in the Blackhawk just in case i didn't think it worked as well as the Apex had in the Airhawk.

Now I have a spare Apex on hand if either one goes out.

Never used a Vortek product so I can't comment on them but I've always been happy with ARH's products.

Blue

[Paul68]

I've found the Vortek seals very well made and durable. Same with the ARH seals. Really haven't found much difference at all quality wise. ARH has a wider selection, Vortek is easier to find the one you need. The ARH seals for some models tend to be slightly oversized and need a light sizing to fit correctly.