Caps, gaskets and spigots

Nalgene carboys and their caps and spigots are custom engineered to work together to provide our 100% leak-proof guarantee.* Because they are designed with custom threads and sealing surfaces, Nalgene carboys will only perform correctly when equipped with the corresponding authentic Nalgene parts. We know caps get lost or "modified" for a special uses, or parts wear out. We offer Nalgene replacement closures, gaskets and spigots to keep your Nalgene carboy going strong for the long haul. 

Replacement spigots and spigot closures for carboys

What is the drawback to making Nalgene carboys super rugged? They sometimes outlast their spigot. Extend the lifetime of your carboy by replacing the spigot if it starts to drip. 

Catalog No.
BlueNatural with blue topNatural
Use with
LDPE, HDPE, PP, and PC carboysFLPE carboysAll carboys

Gaskets and closures for carboys

Have your caps disappeared? It's easy to get a replacement. Match the "closure finish" to that of your carboy or find the matching replacement closure catalog number in the Nalgene Bottle, Carboy and Vial Selection Guide.

Catalog number
Closure finish
Outter diameter
Includes gasket
Compatible gasket
Suggested for use with
4L carboyWide-mouth carboys Heavy Duty JugJugs, large bottlesSterile bottlesLarge carboysSterile carboysJerrican

Replacement gaskets for Nalgene carboy caps

Most Nalgene caps provide a leak-proof seal without a gasket. For added leak protection on some of our larger carboys with buttress-style caps, we use a silicone gasket to provide the ultimate seal. Gasket worn out or gone missing? Replacements are available here.

Catalog No.Fits
712160-005353B caps
712162-183083B caps
83B caps

*The term “leakproof” applies to Thermo Scientific Nalgene products that meet the following criteria: a) Bottle/flask/funnel closure systems with closures smaller than 100mm, after they are filled with water, inverted, withstand air pressure of 2psig for 2 minutes, and no water escapes;. b) Bottle/funnel/flask closure systems of larger than 100mm after they are filled with water, inverted for 15 minutes, and no water escapes. Note: these tests, using other liquids, may not yield the same results. To ensure safe usage, customers are advised to test Thermo Scientific Nalgene bottles and closures under conditions of their planned applications. Thermo Scientific Nalgene products are leakproof at ambient temperature and pressure when used with their Nalgene closures.

Additional resources
  • Break the Glass Habit Brochure
  • Bottle and Carboy Selection Guide
  • Plastic Properties Reference Magnet
  • Plastic Labware Chemical Resistance Wall Poster

Request resources

California Proposition 65 Warning: Products manufactured with polycarbonate (PC), polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG) or polystyrene (PS) contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.