These are the same machined aluminum injector seats used in Radium fuel rail kits. They are required when converting an OEM side feed injector to a top feed injector that uses a 14mm lower O-ring. They simply 'pop' into the intake manifold (1 required per injector). They seal to the machined injector counterbore using the included FKM O-ring. The 2 sizes are based on the intake manifold's inside diameter of each injector counterbore. Below are just a few examples of some popular Nissan engines. 

NOTE: Because they are compatible with different cylinder engines, the injector seats are sold individually (not a set). Change quantity accordingly.

FEATURES
-CNC machined 6061 aluminum
-Bright dipped anodized
-Laser etched logo
-FKM O-rings 

INSTALLATION
Thoroughly clean out any dirt or debris found in the intake manifold injector seat bores. Next, lubricate the Radium Engineering injector seat O-rings with engine oil. Press the injector seats down firmly into the intake manifold injector ports until fully seated. If necessary, use a small rubber mallet. 

20-0160 NISSAN INJECTOR SEAT, 30MM

COMPATIBILITY
NISSAN KA24DE S13
NISSAN KA24DE S14
NISSAN SR20DET S13

All 30mm injector seats (shown below) are black anodized.

The injector seats are CNC machined with a common 14mm bore for the lower injector O-ring.

20-0161 NISSAN INJECTOR SEAT, 25MM

COMPATIBILITY
NISSAN RB25DET (Non NEO)
NISSAN SR20DET S14
NISSAN SR20DET S15
NISSAN SR20VE FWD 

All 25mm injector seats (shown below) are Radium green anodized.

The injector seats are CNC machined with a common 14mm bore for the lower injector O-ring.