This is a genuine  umarex brand co2  seal from umarex europe..to fit these pistols        

Green CO2 Seal for Umarex

Green CO2 bulb seal for the following Umarex pistols: listing is for one seal...         
– Legends Makarov           Umarex H8R Gen2
– Walther P38
– Walther PPQ
– Colt Peacemaker / SAA
– IWI UZI
– H&K 45 Non blowback                              LISTING IS FOR ONE SEAL...
– H&K VP9
– UX Tornado
– UX SA10
– UX SAA Peacemaker                                  MORE PISTOLS BELOW
– Race Gun
– Beretta 84FS
– Beretta APX
– Beretta Elite II
– Beretta APX
– Colt 1911 Special Combat Classic
– Colt Defender
– Smith & Wesson M&P45
– Glock 19X
– Glock 17 Gen 5
– Glock Dual Ammo
– S25
– S40  also  umarex kgb,PPQ M2, BRODAX ,S&W 629 ,MCP ,C96 MAUSER ,BABY DESERT EAGLE ,  

Umarex H8R Gen2

-CROSMAN DPMS SBR                                                                                                                                              - TAC R1 , AK1 , WEBLEY MK6, REMINGTON 1875 ,ASG SCHOFIELD, MILBRO 357, SOME GLETCHERS

This is the seal against which the CO2 capsule fits and the most common to be replaced.

Generally needs to be replaced if a CO2 capsule has been left in the airgun for a long time, which causes leaks when the CO2 is replaced.

size of seal is 

  • 3.3mm Thickness
  • 10.1mm Outer Diameter
  • 1.75mm Internal Diameter (flow diameter)
  • – Walther P38   ++
– Walther PPQ & PPQ M2 & Q4 Tac
– Walther Q6 Match
– Colt Peacemaker / SAA
– IWI UZI
– H&K 45 Non blowback
– H&K VP9
– UX Tornado
– UX SA10
– UX SAA Peacemaker
– Race Gun
– Beretta 84FS
– Beretta APX
– Beretta Elite II
– Beretta APX
– Colt 1911 Special Combat Classic
– Colt Defender
– Smith & Wesson M&P45
– Smith & Wesson M29 / 629
– Glock 19X
– Glock 17 Gen 5
– Glock Dual Ammo
– H&K hw45
– h&k mp5
– h&k USP Fixed
– IWI Uzi
– S25
– S40
– SA10
– TRR8
– 9XP
– 40XP