HEAVY 16 White, 1G/2.5G Cap with 3/4" Reducer for Spigot (4L/10L)

A Replacement Cap That Adds Spigot Compatibility to Smaller Jugs

HEAVY 16's spigot fittings are built around a 3/4 inch opening that the 1 and 2.5 gallon jugs don't have out of the box, so those smaller containers need an adapter cap before a spigot can be installed. This white, BPA-free 70mm cap replaces the standard cap and adds a 3/4 inch NPT center fitting sealed with an EPDM gasket.

Sized for HEAVY 16's 1 gallon (4L) and 2.5 gallon (10L) containers, it lets growers install either of HEAVY 16's 3/4in spigots on those smaller sizes.

Key Features & Benefits

• 70mm cap size — fits HEAVY 16's 1 and 2.5 gallon (4L/10L) container openings
• 3/4in NPT center fitting — creates a threaded opening for HEAVY 16's spigot hardware
• EPDM gasket — seals the cap against leaks once installed
• BPA-free construction — made without bisphenol-A in the cap material

Who Should Use This Cap

Growers with a HEAVY 16 1 or 2.5 gallon container who want to add a spigot instead of unscrewing the standard cap for every pour will use this cap to create that fitting.

About HEAVY 16

HEAVY 16 was formulated by Bryce Patterson, a Cal Poly-trained horticulturist based in Signal Hill, California, around three principles: high-grade raw ingredients, complex chemistry that simplifies application, and micro-batch blending for consistency. Alongside its base nutrients and additives, HEAVY 16 also sells the container hardware — spigots, caps, wrenches, and a transfer pump — that growers need to draw from and open its bulk container sizes.

Frequently Asked Questions

How do I install this cap?

Remove the container's standard cap and thread this 70mm white cap on in its place, then thread either of HEAVY 16's 3/4in spigots into the cap's center fitting. No tools are needed for a standard thread connection.

Which HEAVY 16 container sizes is this cap sized for?

It's sized for HEAVY 16's 1 gallon (4L) and 2.5 gallon (10L) containers, matching their 70mm cap opening. It is not sized for the 6, 15, or 55 gallon containers, which use a different opening.

What does the EPDM gasket do?

The gasket seals the cap against the container opening once installed, reducing the chance of a leak around the seam. EPDM is chosen for its resistance to a wide range of liquid nutrient concentrates.

Is this cap safe for food-contact-adjacent use?

It's made of BPA-free material, which is a common baseline for plastic components that will be in repeated contact with a liquid concentrate. It is not a food-contact-certified product, so treat it as horticultural hardware rather than food packaging.