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.
6422-0010 6432-0010 6423-0010
Blue Natural with blue top Natural
Use with
LDPE, HDPE, PP, and PC carboys FLPE carboys All 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
712160-0384 712150-1000 712155-1200 712160-0530 712151-0053 712160-0830 712151-0083 712240-1053
Natural White White White White White Natural White
Closure finish
38-430 100mm 120mm 53B 53B 63B 63B 53B
27mm 21mm 25mm 42mm 42mm 102mm 102mm 42mm
Outter diameter
42mm 107mm 122mm 65mm 65mm 72mm 72mm 65mm
Includes gasket
no no no no TPE no TPE no
Compatible gasket
None None None 712160-0053 712160-0053 712162-1830 712162-1830 712160-0053
Suggested for use with
4L carboy Wide-mouth carboys  Heavy Duty Jug Jugs, large bottles Sterile bottles Large carboys Sterile carboys Jerrican

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
712160-0053 53B caps
712162-1830 83B 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