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Viton Valve Seal for 2001-2005 GM 6600/6.6L Duramax Diesel; Constructed from Viton, this seal ensures a tight fit on 2001-2005 Duramax Diesels' 7mm valves. Designed specifically for use on the 0.426" guide diameter of the '06-'15 Duramax.

Set of 8 PTFE Valve Seals for .530" Guide Size, 11/32" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 503 seals have a .630" outer diameter and fit applications with 11/32" valves and .530" OD valve guides.

Set of 32 Viton Valve Seals for 2001-2005 GM 6600/6.6L Duramax Diesel; Constructed from Viton, thiese seals ensure a tight fit on 2001-2005 Duramax Diesels' 7mm valves. Designed specifically for use on the 0.426" guide diameter of the '06-'15 Duramax.

1 Umbrella Valve Seal for Stock Guide Size, 3/8" Valve Stem; Typically requiring no machine work, our 504 umbrella seal is a great option for stock guide applications with 3/8" valves needing a seal replacement.

Set of 12 Umbrella Valve Seals for Stock Guide Size, 3/8" Valve Stem; Typically requiring no machine work, our 504 umbrella seals are a great option for stock guide applications with 3/8" valves needing a seal replacement.

1 PTFE Valve Seal for .530" Guide Size, 3/8" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. This 505 seal has a .630" outer diameter and fits applications with 3/8" valves and .530" OD valve guides.

Set of 12 PTFE Valve Seals for .530" Guide Size, 3/8" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 505 seals have a .630" outer diameter and fit applications with 3/8" valves and .530" OD valve guides.

Set of 16 PTFE Valve Seals for .530" Guide Size, 3/8" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 505 seals have a .630" outer diameter and fit applications with 3/8" valves and .530" OD valve guides.

1 Black Viton Valve Seal for .494" Guide Size, 11/32" Valve Stem; Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 506 seal has a .610" OD and fits applications with 11/32" valves and .494" OD guides.

Set of 16 Black Viton Valve Seals for .494" Guide Size, 11/32" Valve Stem; Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 506 seals have a .610" OD and fit applications with 11/32" valves and .494" OD guides.

1 PTFE Valve Seal for .500" Guide Size, 11/32" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. This 510 seal has a .600" outer diameter and fits applications with 11/32" valves and .500" OD valve guides.

Set of 12 PTFE Valve Seals for .500" Guide Size, 11/32" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 510 seals have a .600" outer diameter and fit applications with 11/32" valves and .500" OD valve guides.