Connectors

Connectors: the small parts that make a wiring job or fuel line actually seal

Connectors are the parts that join two ends of a circuit or a fluid line and hold that joint tight through heat and vibration. In engine work that covers two jobs: electrical connectors that plug a sensor, injector or ECU harness together with sealed pins, and threaded fluid connectors that link an AN line into a fitting. Get the pin seated wrong or thread the wrong AN size and you get an intermittent signal or a slow weep - which is why builders keep the right housings, terminals and connector bodies on the bench before they start pinning a harness.

What ThreePiece stocks

This is a focused category: 4 connectors in stock from 4 brands - Haltech, Fragola, DeatschWerks and Injector Dynamics. Current prices run from $17 for a single USCAR terminal up to about $84 for a full Haltech AMP 34-pin Superseal plug and pin set - that range reflects what is in stock now, not a locked price.

How to choose

Work back from the joint you are making. If you are wiring an ECU or a large harness plug, the Haltech AMP 34-pin Superseal set gives you the housing and pins in one part. If you are re-pinning an injector connector, the DeatschWerks USCAR housing and pin kit covers the whole connector, while the Injector Dynamics individual USCAR terminal is the cheaper choice when you only need to replace one bent or corroded pin rather than the whole plug. For a fluid joint rather than an electrical one, the Fragola -8AN female connector is the part that ties an AN line into your plumbing. The honest split here is electrical versus fluid, and whole-connector versus single-terminal - buy the smallest part that fixes your problem.

What else you need with it

Electrical connectors rarely go in alone. If you are plumbing fuel, pair the AN connector with the right Fittings and Adapters so the thread and size actually match. Injector connector work usually happens alongside Fuel Pumps during a fuel system refresh, and a fresh harness often lands in the same weekend as Batteries or Gasket Kits during a wider engine job. Browse the full Engine Components section to see the sibling categories that tie in.

Fitment and ordering

Match connectors to the harness, injector or line they plug into - check the pin count, terminal type and AN size against your existing part before you order. If you are not sure which terminal or housing you need, call our team at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout through financing.

Connectors: the small parts that make a wiring job or fuel line actually seal

Connectors are the parts that join two ends of a circuit or a fluid line and hold that joint tight through heat and vibration. In engine work that covers two jobs: electrical connectors that plug a sensor, injector or ECU harness together with sealed pins, and threaded fluid connectors that link an AN line into a fitting. Get the pin seated wrong or thread the wrong AN size and you get an intermittent signal or a slow weep - which is why builders keep the right housings, terminals and connector bodies on the bench before they start pinning a harness.

What ThreePiece stocks

This is a focused category: 4 connectors in stock from 4 brands - Haltech, Fragola, DeatschWerks and Injector Dynamics. Current prices run from $17 for a single USCAR terminal up to about $84 for a full Haltech AMP 34-pin Superseal plug and pin set - that range reflects what is in stock now, not a locked price.

How to choose

Work back from the joint you are making. If you are wiring an ECU or a large harness plug, the Haltech AMP 34-pin Superseal set gives you the housing and pins in one part. If you are re-pinning an injector connector, the DeatschWerks USCAR housing and pin kit covers the whole connector, while the Injector Dynamics individual USCAR terminal is the cheaper choice when you only need to replace one bent or corroded pin rather than the whole plug. For a fluid joint rather than an electrical one, the Fragola -8AN female connector is the part that ties an AN line into your plumbing. The honest split here is electrical versus fluid, and whole-connector versus single-terminal - buy the smallest part that fixes your problem.

What else you need with it

Electrical connectors rarely go in alone. If you are plumbing fuel, pair the AN connector with the right Fittings and Adapters so the thread and size actually match. Injector connector work usually happens alongside Fuel Pumps during a fuel system refresh, and a fresh harness often lands in the same weekend as Batteries or Gasket Kits during a wider engine job. Browse the full Engine Components section to see the sibling categories that tie in.

Fitment and ordering

Match connectors to the harness, injector or line they plug into - check the pin count, terminal type and AN size against your existing part before you order. If you are not sure which terminal or housing you need, call our team at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout through financing.