LAIKOU Injector Seal Installer Kit, 8‑Piece for Hitachi/Bosch/Continental Injectors — Teflon Seal Resizers & Stretchers

LAIKOU 34720 Injector Seal Installer Kit is an 8-piece tool set designed to fit Hitachi, Bosch, Continental and similar fuel injectors to replace Teflon injector seals cleanly and accurately.

If you're replacing worn or leaking fuel injector seals on many Ford, GM and Subaru engines, this kit provides the shaping, stretching and sizing tools needed to seat single- and dual-seal Teflon rings without damaging the injector tip. The set groups a seal pusher, several stretchers and multiple resizers in a compact case so technicians and do-it-yourselfers can work faster and avoid ruined seals or sore fingers.

Which vehicles and injectors will this kit work with?

This installer set was built to match common dimensions used by Hitachi, Bosch, Continental and Delphi injectors, including many Ford ECO and GM systems from the 2010s and select Subaru turbo engines. It covers both single and dual Teflon-style seals used across a wide range of modern engines.

• GM: compatible with many 2010+ engines (1.4L–6.2L ranges listed in product specs).
• Subaru: fits 2014–2019 2.0L and 2.4L turbo applications that use similar seal designs.
• Ford: supports numerous 2011+ Ford injector designs including some direct-injection ECO variants.

How do I use the tools to install a Teflon injector seal correctly?

The process is deliberate: start by using the pilot cone to guide the seal onto the injector tip, then use the seal pusher to slide the ring into place. After the seal is on the injector, select the correct resizer to compress the seal back to the proper outer diameter so it will seat into the cylinder head without tearing or binding.

• Place pilot cone on injector tip and start the seal over the cone.
• Use the seal pusher to advance the ring along the cone and into the groove.
• Pick the correct resizer to compress the seal to the proper OD for installation.

What tools are included and what sizes do they cover?

The 34720 kit contains eight distinct tools organized for quick selection during service. Stretchers and resizers span a range of diameters so you can handle both small and larger Teflon seals used across different injector families.

• #34630 — Seal Pusher to move seals along the pilot cone.
• #34640/.312 and #34650/.310 — Injector seal resizers for compressing seal OD.
• #34670/.160, #34680/.250, #34690/.330, #34700/.408 and #34710/.430 — Seal stretchers for a range of seal inner diameters.

Will using this kit prevent leaks and make installation faster?

Using purpose-built installer tools significantly reduces the risk of nicked or twisted seals, which are common when forcing rings by hand. The correct fit and controlled resizing produce a cleaner, repeatable install that reduces rework and helps create a proper seal at the injector tip.

• Reduces damage to delicate Teflon rings compared with manual methods.
• Saves time by guiding seals into place and compressing to the correct size.
• Makes repetitive work easier and reduces finger fatigue.

Who is this for: mechanics, service shops and experienced DIYers who replace fuel injector seals on Ford, GM and Subaru engines will find the LAIKOU 34720 kit helpful. If you service vehicles that use Hitachi, Bosch, Continental or Delphi injectors and want consistent, professional results without buying separate specialty pieces, this compact set organizes the most common sizes and tools needed for everyday injector seal work.