If you’re upgrading a 55-gallon drum setup, these 55 gallon drum thread adapters help you connect pumps, spouts, and hoses quickly and securely. This guide highlights options for common drum thread types, including buttress and NPT connections, so you can pick the right adapter for your drum opening and pumping needs. Ideal buyers include hobbyists, workshop builders, rainwater collectors, and small-scale manufacturers who need reliable, corrosion-resistant fittings that fit standard drum openings.
| Product | Best For | Opening Type | Material |
|---|---|---|---|
| Set of 3 Dafna 2″ Female NPT x 2″ Male Buttress | Multiple Piping Or Drums | 2″ Buttress to 2″ NPT | Polypropylene |
| 63mm Buttress Adapters for Drums (63MM-25) | Pumps On Plastic Barrels | 63mm Buttress | Plastic/Coarse Thread |
| Bung Cap 2″ with 3/4″ Knock Out Combo | Versatile 55g Drums | 2″ Buttress & 2″ NPT | Plastic |
| Action Pump 63MM-25 Buttress to NPT | Drum Pumps | 63mm Buttress to NPT | Polyethylene |
| 55 Gallon Drum Faucet Kit with 2″ Adapter | Liquid Dispensing | 2″ Stainless Adapter | Stainless Steel/Brass |
Dafna Set of 3 — 2″ NPT x 2″ Buttress Adapters
These polypropylene adapters convert 2″ NPT fittings to 2″ buttress openings, enabling quick connections between drums and pumps. Best for users who need a resilient, chemical-resistant option that fits domestic 2″ buttress drum fittings.
- Best for: Multiple drum setups and pump connections that require 2″ buttress to 2″ NPT linkage.
- Why chosen: Durable polypropylene resists most chemicals and weather exposure; compact for tight spaces.
- Caution: Fits only domestic 2″ buttress fittings; verify your drum opening before buying.
63mm Buttress Adapters for Drums (63MM-25)
This adapter bridges a 63mm buttress drum opening to a 2-5/8″ NPT internal thread, allowing standard barrel pumps to connect to plastic drums or tanks with a 63mm buttress opening. Best for: plastic barrels or tanks used with common drum pumps.
- Best for: 63mm buttress openings common on many drum systems.
- Why chosen: Simple thread conversion for pump compatibility; helps standardize connections.
- Caution: Ensure the external 63mm opening matches your drum; compatibility varies by drum model.
Green Goods Bung Cap 2″ — Combo (Buttress & NPT)
A dual-fit bung cap offering both 2″ buttress and 2″ NPT threads in one cap. Best for drums requiring quick swap between buttress and NPT connections without swapping hardware.
- Best for: Drums where occasional buttress-to-NPT changes are needed.
- Why chosen: Versatile compatibility with popular drum fittings around 2″ sizes.
- Caution: Plastic construction may not be ideal for high heat or heavy chemical exposure.
Action Pump 63MM-25 — Buttress to NPT
Designed to adapt 63mm buttress receptacles to NPT fittings, this polyethylene adapter is a practical choice for chemical resistance and pump compatibility. Best for: Drums where a straightforward buttress-to-NPT conversion is needed.
- Best for: Direct pump connections to 63mm buttress openings.
- Why chosen: Lightweight, chemical-resistant material; easy to install.
- Caution: May not fit all 63mm drums if the buttress thread is misaligned or damaged.
55 Gallon Drum Faucet Kit with 2″ Adapter
This kit includes a 2″ stainless steel drum adapter plus a 3/4″ NPT inlet and 5/8″ brass outlet valve, with EPDM gaskets and sealing tape for leak resistance. Best for: Reliable dispensing from rain barrels, water barrels, or oil drums.
- Best for: End-to-end dispensing with a built-in adapter and durable materials.
- Why chosen: Stainless steel adapter and brass valve provide corrosion resistance and longevity outdoors.
- Caution: The assembly requires proper sealing to prevent leaks at threaded joints.
Buying Guide
What opening type do I need?
Identify whether your drum uses buttress or NPT threads. Buttress openings are common on many drum brands, while NPT is standard for many fittings and pumps. Match the adapter to the drum opening to ensure a proper seal and a secure connection.
Which material matters?
Polypropylene works well for general chemicals and weather exposure, offering light weight and corrosion resistance. Polyethylene is durable for pump connections and chemical handling. Stainless steel and brass components excel in high-resistance and longer life in outdoor or high-usage scenarios.
What is the best fit for dispensing?
For dispensing, look for kits that include a spigot or valve compatible with your liquid type and flow rate. Brass valves provide solid performance; ensure the gasket material (EPDM, etc.) is compatible with your liquid.
Are there safety considerations?
Check for compatibility with UN-certified drums if you handle hazardous materials. Ensure proper seals and caps to prevent leaks and spills, and use caps that properly match the opening to avoid cross-threading.
How to select 1 adapter or a kit?
Choose a single adapter if you know your exact connection needs. Opt for a kit when you require flexibility for multiple drum setups or frequent swaps between buttress and NPT connections.
Maintenance tips
- Inspect threads for damage before installation.
- Replace gaskets and seals if you notice leaks.
- Rinse with safe solvents when dealing with heavy residues, following safety guidelines for your liquid type.
FAQ
- Q: Do these adapters fit all 55-gallon drums? A: Adapters are designed for common buttress and NPT drum fittings; always verify opening size before purchase.
- Q: Can I use these with hot liquids? A: Material compatibility varies; polypropylene and polyethylene handle many chemicals but not extreme heat. Check your liquid’s temperature rating.
- Q: Is a leak-proof seal guaranteed? A: Proper installation with compatible gaskets and seals reduces leaks; inspect connections after initial use.
- Q: Should I use a separate cap for the drum after installing an adapter? A: Yes, sealing caps that fit the opening help prevent leaks and contamination when the drum is not in use.
- Q: Which adapter is best for a rain barrel? A: The 2″ buttress/NPT combo or the buttress-compatible adapters are commonly used, depending on your pump or faucet fitment.
- Q: Do these require special tools to install? A: Most adapters require standard wrench or hand-tightening; follow the manufacturer’s torque recommendations.