CLASSIC NBU Cylinder Head Spare O-ring (2 pcs)

AirsoftParts Replacement Seals for the CLASSIC NBU Cylinder Head
The NBU version is designed for the corresponding Bore Up air seal system, so it is important to use the correct size seal for this cylinder head when replacing it. The O-ring provides a seal between the cylinder head and the inner wall of the cylinder, and its condition directly affects the sealing of the entire assembly. During use, the rubber can gradually age, deform or wear, which may lead to unwanted air leakage and less consistent performance. The manufacturer therefore recommends replacement approximately every 10,000 BBs fired or once a year. The package contains two replacement O-rings, providing one for the current replacement and another for future servicing.
Key Features

For the CLASSIC NBU Cylinder Head
The replacement O-rings are designed for servicing the AirsoftParts CLASSIC NBU cylinder head and the corresponding Bore Up air seal system.

Restores Proper Sealing
A new O-ring helps restore the seal between the cylinder head and cylinder and reduce unwanted loss of compressed air during firing.

Recommended Service Interval
The manufacturer recommends replacing the seal approximately after every 10,000 BBs fired or once a year, whichever comes first.

Replacement Without a New Cylinder Head
If the cylinder head itself is in good condition, the replacement seal allows you to replace only the worn O-ring and keep the original component in service.

Two O-Rings Included
The package contains two replacement sealing O-rings, allowing one to be used for the current service and the other to be kept as a spare.

Technical Specifications

Type: Replacement cylinder head sealing O-ring
Compatibility: AirsoftParts CLASSIC NBU cylinder head
System: NBU / Bore Up
Function: Se..