Park Tool tubeless sealant injector TSI-1 — 100cc syringe, clear gauge, Presta core fit (blue)

The Park Tool TSI-1 is a syringe-style tubeless sealant injector that lets you add or remove sealant through removable Presta valve cores cleanly and precisely.

Setting up or topping off tubeless bicycle tires can be messy and awkward — the TSI-1 streamlines the job. Built for riders and mechanics, this oversize syringe accepts up to 100 cc (3.5 fl oz) of any injectable tubeless sealant and uses a long, thin tube to reach through most removable Presta cores so you never have to unseat the tire bead. Its clear body and readable gauge make measuring and controlling sealant easy, and the tool’s simple design reduces spills during maintenance or roadside repairs.

How does the TSI-1 make tubeless setup and maintenance simpler?

The injector removes the need to remove the tire bead or pour sealant into the rim, which can be time-consuming and messy. By delivering sealant straight through the Presta valve core, the TSI-1 speeds up both initial setups and mid-ride top-ups, and it keeps hands and rims cleaner.

• Direct injection through removable Presta cores — no bead removal required
• Long, flexible tube reaches the valve stem interior reliably
• Clear syringe body with printed gauge for accurate dosing
• Large 100 cc capacity reduces the need for multiple refills

Can I use the TSI-1 with any tubeless sealant and valve type?

The TSI-1 is compatible with most injectable tubeless sealants and fits Presta stems that allow valve core removal. It is not designed for Schrader valves unless an adapter or a removable Presta core is used; always confirm your valve type before use.

• Works with water-based and latex-style injectable sealants
• Fits most Presta valves with removable cores — check fit before injecting
• Not intended for fixed-core valves or non-injectable thick sealants

What features help control sealant volume and minimize mess?

Park Tool engineered the TSI-1 with a large, easy-to-read gauge and an oversized barrel so you can measure and deliver the exact amount needed. The long thin delivery tube threads through the valve core area, and a smooth plunger action reduces splatter and wasted product.

• Printed measurement marks on the syringe body for precise dosing
• Smooth plunger and snug tube connection to prevent leaks and drips
• 100 cc capacity avoids multiple re-fills for most wheel sizes
• Compact, lightweight design for workshop or trail use

How do I keep the TSI-1 clean and store it between uses?

Rinsing the syringe and tubing after each use prevents sealant buildup and keeps the injector ready for future maintenance. Disassemble the delivery tube and plunger, flush with warm water (or the sealant manufacturer’s recommended solvent) and allow all parts to air dry before reassembly.

• Disassemble plunger and tube for thorough cleaning
• Flush with warm water or appropriate solvent immediately after use
• Dry fully to avoid sealant hardening inside the injector
• Store in a cool, dry place away from direct sunlight

Who is this for: The Park Tool TSI-1 is ideal for cyclists, bike mechanics, and bike shops that want a fast, precise, low-mess way to add or remove injectable tubeless sealant. It suits riders who do their own tubeless setups and need a reliable, easy-to-clean tool for workshop or mobile use. If you regularly service tubeless wheels or need to top off sealant on the trail without unseating tires, the TSI-1 streamlines the process and keeps sealant where it belongs — inside the tire.