100 Self-Sealing Butyl Rubber Injection Ports for 13mm Jars

Keep your liquid culture jars, grain masters, and substrate containers perfectly sealed with these Self-Sealing Butyl Rubber Injection Ports. Designed to snap securely into any 13mm (½ inch) opening, each stopper forms an airtight barrier and self-heals after every needle insertion — no tape, no mess, no contamination risk. Made in Mainland China.

Key Features

• Self-Healing Design: The butyl rubber seals itself after each needle pass, maintaining a reliable, contamination-free environment between inoculations.
• Durable Butyl Rubber: Excellent heat stability and chemical resistance make these ports suitable for repeated sterilization cycles.
• Perfect Fit for 13mm Openings: Outer diameter of 12.5mm (≈0.49") and inner diameter of 7.2mm (≈0.28") — designed for a precise snap-on fit in standard 13mm glass jar lids.
• Versatile Use: Ideal for liquid culture (LC) syringes, BRF jars, supplemented substrate jars, grain masters, and other laboratory or cultivation containers.
• Bulk Value Pack: 100 injection ports per pack — plenty for large-scale grows, labs, or restocking your supplies.

Specifications

• Material: Butyl Rubber
• Color: Grey
• Outer Diameter: 12.5mm / 0.49" (approx.)
• Inner Diameter: 7.2mm / 0.28" (approx.)
• Quantity: 100 pieces per pack
• Fits: 13mm or ½-inch diameter jar openings

What's in the Box?

• 100 × Butyl Rubber Self-Sealing Injection Ports

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Learn more: Ready.gov emergency supply guidance

Frequently Asked Questions

Q: What size jar lids are these butyl rubber injection ports compatible with?

A: These self-sealing injection ports are specifically designed for 13mm (½ inch) diameter openings — the standard size found on wide-mouth mason jars, BRF jars, grain master lids, and most liquid culture jar lids. The outer diameter is approximately 12.5mm for a secure snap-on fit.

Q: Can these rubber stoppers be sterilized in a pressure cooker?

A: Yes. The butyl rubber material offers good heat stability, making these injection ports suitable for pressure cooker sterilization cycles commonly used in liquid culture and substrate preparation workflows.

Q: Do these ports truly self-seal after a needle is inserted and removed?

A: Absolutely. The butyl rubber construction allows the material to close back over the needle hole after each insertion, helping to maintain an airtight, contamination-resistant seal throughout the inoculation process.

Q: How many injection ports come in a pack?

A: Each pack includes 100 self-sealing butyl rubber injection ports, providing excellent bulk value for hobbyists and professionals alike.