Home / Parts / Waterkey Seals / JLS Technician Opti-Kork Waterkey Cork Assortment
technician opti kork waterkey assortment

JLS Technician Opti-Kork Waterkey Cork Assortment


JLS Opti-Kork Waterkey Corks are synthetic peel-and-stick waterkey cork seals.

The “Opti-Kork” line was introduced in 2018 as an aesthetic alternative to our popular JLS Waterkey Corks which are still available to order. Since then, Opti-Korks have become our most popular waterkey cork seals.

  • Standard Waterkey Corks are 4.6mm (.180”) thick.
  • Thin Waterkey Corks are 3.4mm (.135”) thick.


  • The main advantage of using synthetic v. natural cork is that synthetic cork won’t deteriorate over time from water and saliva.
  • Synthetic waterkey corks are much easier to install due to their peel-and-stick adhesive backing.
  • Synthetic waterkey corks are more forgiving and will allow for more compression than either natural corks or neoprene.

“Everybody should be using synthetic corks.” – J.L. Smith


In Stock

SKU: 700027


The JLS Technician Opti-Kork Waterkey Cork Assortment is a comprehensive assortment of 408 synthetic waterkey cork seals in a sturdy divided assortment box.

Standard Thickness:

  • 8.5mm
  • 9mm
  • 9.5mm
  • 10mm
  • 10.5mm
  • 11mm
  • 11.5mm
  • 12mm

Thin Thickness:

  • 8mm
  • 9mm
  • 10mm
Shipping & Delivery

Please note: Express & Overnight Shipping deliveries will require a signature. Please ensure someone is available at the delivery address to provide a signature to avoid any issues.

Domestic Shipping
Economy $10.95
FedEx Ground Shipping $15.95
FedEx 2 Day $34.95
FedEx Overnight $44.95
International Shipping Puerto Rico and Guam Canada and Mexico International General
USPS Economy $9.95 $29.95 N/A
USPS Priority Mail International N/A $49.95 $59.95
FedEx International Economy $29.95 $39.95 $44.95
FedEx International Priority $39.95 $49.95 $69.95

Please be aware that orders with certain products may take longer to deliver depending on their stock levels and lead times.

For information about our Return Policy, please check here.