Send a part number, a photo, or a whole BOM — we supply it and stand behind it. EXW Singapore — collect from our office.

3G Electric
Image not available
ARMSTRONG INTERNATIONALReplacement Gaskets

ARMSTRONG INTERNATIONAL Steam Trap Cover Gasket, A21959-1

This is a replacement steam trap cover gasket from Armstrong International, model A21959-1, compatible with the D500057 steam trap in the AI series. It is a repair part designed for use with Armstrong 36Y259 units…

SKU 3G-OTH-69228

Also listed as: A219591 · A21959 1

Brand
ARMSTRONG INTERNATIONAL
Item
Steam Trap Cover Gasket, A21959-1
Part Number
A21959-1
Category
Replacement Gaskets
Available to Order
Also known as:A21959-1ARMSTRONG INTERNATIONAL
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

ARMSTRONG INTERNATIONAL
Manufacturer Part Number
A21959-1
Product Type
Steam Trap Cover Gasket
Compatible Series
AI
Compatible Manufacturer Model Number
D500057

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

ARMSTRONG INTERNATIONAL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

This is a replacement steam trap cover gasket from Armstrong International, model A21959-1, compatible with the D500057 steam trap in the AI series. It is a repair part designed for use with Armstrong 36Y259 units. The gasket provides a seal for the steam trap cover, ensuring proper operation of the equipment.

Frequently Asked Questions

What is the Armstrong A21959-1 steam trap cover gasket used for?

The Armstrong A21959-1 steam trap cover gasket seals the cover of Armstrong D500057 steam traps in the AI series. It prevents steam leakage, maintains system pressure, and ensures efficient condensate removal in industrial steam systems across power generation, chemical processing, and HVAC applications.

What are the specifications of the Armstrong A21959-1 gasket?

The Armstrong A21959-1 is a steam trap cover gasket compatible with the D500057 model in the AI series. It is a repair part for Armstrong 75A6 units. Key specs include brand Armstrong International, product type steam trap cover gasket, and manufacturer part number A21959-1.

Where to buy Armstrong A21959-1 gaskets worldwide?

3G Electric supplies the Armstrong A21959-1 steam trap cover gasket worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this genuine Armstrong repair part.

How to install the Armstrong A21959-1 steam trap cover gasket?

To install the Armstrong A21959-1 gasket, first ensure the steam trap is depressurized and cool. Remove the old gasket and clean the sealing surfaces. Place the new gasket on the cover, then reattach and torque the cover bolts evenly to the manufacturer's specifications to prevent leaks.

Used in

Common applications for ARMSTRONG INTERNATIONAL
Steam distribution headers — Armstrong International inverted bucket steam traps (e.g., 883-075-250) for condensate removal at pressures up to 250 psi.
Corrosive condensate systems — Stainless steel Armstrong International traps (e.g., 1811-075-400) for resistance to acidic or high-purity condensate.
High-pressure steam lines — Armstrong International 1822-100-250 traps rated to 250 psi and 600°F for superheated steam applications.
Tracer line drainage — Armstrong International 1811 series traps with 1/2 in or 3/4 in connections for freeze protection and process temperature maintenance.
Steam system strainer protection — Armstrong International inline strainers (e.g., 304 stainless steel, 3/4 in NPT) to capture debris upstream of traps and valves.
HVAC and process equipment — Armstrong International inverted bucket traps for condensate removal from heat exchangers, coils, and unit heaters.
Not sure this is the right part? Photo-identify it→

ARMSTRONG INTERNATIONAL Products

3G Electric supplies ARMSTRONG INTERNATIONAL replacement gaskets. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

More from ARMSTRONG INTERNATIONAL

View all ARMSTRONG INTERNATIONAL parts →
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement cover gasket for the D1175-5 steam trap in the AI series. Seals the trap body to prevent steam leakage. Used as a repair part in steam systems for condensate removal
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement cover gasket for Armstrong 800 series steam traps, compatible with model C5318-35. Used to seal the cover and prevent steam leaks in industrial steam systems. Serves as a repair part for the 814-125-030 assembly
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement cover gasket for steam traps, compatible with Armstrong C6121 model and KD series. Seals the trap cover to prevent steam leakage in condensate removal systems. Direct replacement for 15JD8
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement gasket for steam trap covers, compatible with Armstrong 800 series and model C5297-2. Provides sealing to prevent steam leakage in condensate removal systems for process heating and HVAC applications
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
This replacement gasket is designed for use as a steam trap cover gasket in Armstrong 800 Series steam traps and the D526130 model. It serves as a repair component to seal the cover of a steam trap assembly, preventing steam leakage and supporting efficient condensate removal in steam systems
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement cover gasket for Armstrong model D500173 and series A steam traps. Seals the trap cover to prevent steam leakage and maintain system pressure in condensate removal applications
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement cover gasket for Armstrong 800 series steam traps, compatible with model C5318-17. Seals the cover to prevent steam leaks in industrial steam systems such as process heating and condensate return lines
ARMSTRONG INTERNATIONAL
ARMSTRONG INTERNATIONAL
Replacement cover gasket for Armstrong Series 800 steam traps. Compatible with model D501221. Provides a seal for the steam trap cover in steam systems

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first