100 Pcs Butyl Rubber Injection Port Stoppers for 13mm Jars

100-Pack Butyl Rubber Self-Sealing Injection Ports for 13mm Glass Bottles

Keep your liquid cultures, grain jars, and substrate containers perfectly sealed with these durable butyl rubber injection ports. Designed to snap securely into any 13mm (½ inch) diameter opening, each stopper creates an airtight barrier that re-seals itself after every syringe injection — no extra covers or tape needed. Made in Mainland China.

Specifications

• Material: Butyl Rubber
• Color: Grey
• Outer Diameter: 12.5 mm / 0.49" (approx.)
• Inner Diameter: 7.2 mm / 0.28" (approx.)
• Fits Opening: 13 mm / ½ inch diameter holes
• Quantity: 100 injection ports per pack

Key Features

• Airtight Snap-On Seal: Each stopper snaps firmly into the jar lid opening, forming a reliable, contamination-resistant barrier around your contents.
• Self-Sealing Butyl Rubber: The flexible butyl rubber material closes back up after a needle is inserted and withdrawn, allowing repeated, clean injections without compromising the seal.
• Excellent Heat Stability: Butyl rubber maintains its integrity under sterilization temperatures, making these ports suitable for pressure cooker and autoclave use.
• Universal 13mm Fit: Perfectly sized for standard 13mm or ½-inch holes — compatible with wide-mouth mason jars, BRF jars, grain spawn jars, supplemented substrate jars, and Grain Masters.
• Bulk Pack of 100: Stock up with confidence — 100 ports per order keeps your entire grow setup covered without running short.

Ideal Applications

• Liquid culture jars & syringes
• BRF (Brown Rice Flour) jars
• Grain spawn & Grain Masters
• Supplemented substrate jars
• Any laboratory or home-use glass bottle requiring repeated sterile access

What's in the Box

• 100 × Butyl Rubber Self-Sealing Injection Ports

You May Also Like

• 2.8L Beverage Dispenser with Spigot – Fridge Drink Dispenser
• Large Capacity Pencil Pen Bag – Zipper Fabric Stationery Organizer
• 8-Piece Stainless Steel Shot Glasses Set with Storage Bag

Learn more: Ready.gov emergency supply guidance

Frequently Asked Questions

Q: What size hole do these rubber injection port stoppers fit?

A: These butyl rubber stoppers are designed for a 13mm (½ inch) diameter opening. The outer diameter is approximately 12.5mm, allowing them to snap snugly into standard 13mm jar lid holes used on mason jars, BRF jars, and grain jars.

Q: Can these injection ports withstand pressure cooker sterilization?

A: Yes. The butyl rubber material offers excellent heat stability, making these ports well-suited for sterilization in a pressure cooker or autoclave before use. Always allow jars to cool completely before inoculation.

Q: How many times can a single injection port be used?

A: Thanks to the self-sealing property of butyl rubber, these ports are designed to reseal after each needle insertion. With proper care and sterile technique, a single port can withstand multiple injections while maintaining a reliable seal and minimizing contamination risk.

Q: Are these ports compatible with liquid culture jars?

A: Absolutely. These self-sealing injection ports are widely used for liquid culture jars, BRF jars, supplemented substrate jars, and Grain Masters — anywhere you need sterile, repeated syringe access to a sealed container.