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Aluminum Adapters - Caps & Plugs
Earle Caps and Plugs AN Cap AN Plug Port Plug NPT Plug - Internal Wrenching NPT Plug - Hex Head

Earl's offers the most complete line of adapter fittings in the industry. In addition to the standard range of AN adapters in both aluminum and steel, for over the past 30 years Earl's has designed and manufactured a wide selection of special adapter fittings to meet the needs of the racing industry. These specials include metric to AN, inverted flare to AN and power steering fittings.

Refer to the Technical Section for AN number to tube size conversion.

Note: Because we deal predominately with motorcycles, we usually only stock -3, -4, and -6 sizes. We can special order anything Earl's offers.

Part Number

Description Racer Price

40-592902ERL

 EARLS CAPS -2

$6.17

40-592903ERL

 EARLS CAPS -3

$5.94

40-592904ERL

 EARLS CAPS -4

$6.16

40-592906ERL

 EARLS CAPS -6

$6.16

40-992908ERL

 EARLS -8 CAP

$5.78

40-580603ERL

 EARLS -3 FLARE PLUG

$4.59

40-580604ERL

 EARLS -4 FLARE PLUG

$4.59

40-580606ERL

 EARLS -6 FLARE PLUG

$4.59

40-980608ERL

 EARLS -8 FLARE PLUG

$3.71

40-581403ERL

 EARLS -3 PORT PLUG

$5.66

40-581404ERL

 EARLS -4 PORT PLUG

$6.79

40-581406ERL

 EARLS -6 PORT PLUG

$6.79

40-981408ERL

 EARLS -8 PORT PLUG

$4.77

40-593201ERL

 EARLS 1/16" NPT PLUG

$8.05

40-593202ERL

 EARLS 1/8" NPT PLUG

$8.05

40-593203ERL

 EARLS 1/4" NPT PLUG

$8.05

40-593204ERL

 EARLS 3/8" NPT PLUG

$9.23

40-993301ERL

 EARLS 1/8" NPT HEX PIPE PLUG

$3.02

40-993302ERL

 EARLS 1/4" NPT HEX PIPE PLUG

$4.42

40-993303ERL

 EARLS 3/8" NPT HEX PIPE PLUG

$4.42