• 6 reusable silicone covers that replace foil over jar lids
  • Shields lid filters and injection ports from direct steam
  • Molded to shed condensation away from the filter as jars cool
  • Food-grade silicone rated to 400°F
  • Choose standard-mouth 70mm or wide-mouth 90mm
Retail: $16.99
Price: $11.99
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    Microppose Silicone Jar Lid Covers, Standard or Wide Mouth (6-Pack) silicone jar lid cover, jar lid cover, foil replacement, pressure cooker jar cover, wide mouth jar cover, mushroom jar, Microppose

    Microppose Silicone Jar Lid Covers, Standard or Wide Mouth (6-Pack)

    Price: $11.99

    Reusable food-grade silicone caps that go over your jar lids in the pressure cooker. They replace foil, shield lid filters and injection ports from direct steam, and are molded to shed condensation off to the side as jars cool, so water doesn't pool on the filter.

    Rated to 400°F, well above pressure-cooker and autoclave temperatures. Sold in 6-packs for standard-mouth (70mm) or wide-mouth (90mm) jars; choose your size above.

    • 6Covers per pack
    • 70mmStandard mouth
    • 90mmWide mouth
    • 400°FHeat rating
    • SiliconeFood grade

    Why growers switch from foil

    Protects filters and ports

    Keeps direct steam and dripping condensation off filter disks and injection ports during sterilization.

    Sheds condensation

    The molded shape channels water to the side as jars cool instead of letting it pool on the filter.

    Reuse, don't tear off

    Wash and reuse them run after run instead of tearing off a new sheet of foil for every jar.

    How to use them

    1Cap the jars

    Close your jars with their filter or port lids as usual, then press a silicone cover over each lid.

    2Sterilize

    Pressure-cook or autoclave the jars with the covers in place.

    3Cool covered

    Leave the covers on while the jars cool so condensation runs off instead of onto the filter.

    4Remove and wash

    Take the covers off before you inoculate, then wash and dry them for the next batch.

    Pick your size: 70mm covers fit standard (regular) mouth jars; 90mm covers fit wide-mouth jars, including jars with our wide-mouth cultivation lids or Myco Lid Pro.

    Specifications

    SpecDetail
    BrandMicroppose
    MaterialFood-grade silicone
    Heat ratingUp to 400°F
    SizesStandard-mouth 70mm or wide-mouth 90mm
    Pack6 covers
    UseJar sterilization in pressure cookers and autoclaves
    ReusableYes, wash between uses

    Pair them withWide-mouth cultivation lids with a filter and port, 90mm synthetic filter discs and self-healing injection ports for DIY lids, or the Myco Lid Pro for liquid culture.

    Frequently asked questions

    What size jars do they fit?

    The 70mm covers fit standard (regular) mouth jars, and the 90mm covers fit wide-mouth jars.

    Can they go in a pressure cooker or autoclave?

    Yes. They're food-grade silicone rated to 400°F and made for pressure cooking and autoclaving.

    Do they replace foil?

    Yes. They cover your lids the way foil does, but they're reusable and shaped to shed condensation away from the filter.

    Should I leave them on while jars cool?

    Yes. Leaving them on while jars cool keeps condensation off the filter. Remove them before you inoculate.

    How do I clean them?

    Wash them in warm, soapy water, rinse and let them dry before the next run.

    Overall Customer Rating of 6 Reviews:
    review-star review-star review-star review-star review-star

    These rubber tops work perfectly

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    I am a beginner and wasn’t sure about these tops vs using foil….they are easy to put on and are secure. They worked well

    IL

    Silicone Jar Protectors

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    • Quality
    • cleanliness
    • easy to use
    Cons:
    • Offer an 8 or 9 pack
    Highly satisfied with the product, makes things a lot cleaner without having to fuss with aluminum foil. I would appreciate an 8 pack, as I think everyone knows how many wide mouth jars fit into a pressure cooker. Keep up the good work guys!

    CA

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    • Great quality
    Cons:
    • None
    Excellent quality

    CA

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    • Quality
    Cons:
    • Nome
    Excellent product

    WI

    Excellent Product! Delivered quickly!

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    The product was as described and delivered quickly.