Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
APOLLO 4A Dual Check Valve with Atmospheric Vent, 1/2 in, FIP x FIP, Bronze - Potable Water Dual Check Backflow Preventers
APOLLOPotable Water Dual Check Backflow Preventers

APOLLO 4A Dual Check Valve with Atmospheric Vent, 1/2 in, FIP x FIP, Bronze

The APOLLO Dual Check Valve with Atmospheric Vent (Model 4A, MPN 4ALF4A33AM) is a potable water dual check backflow preventer with a 1/2 in pipe size, FIP x FIP connections, a 23 gpm flow rate, and a bronze body.

SKU 3G-OTH-437171

Brand
APOLLO
Item
4A Dual Check Valve with Atmospheric Vent, 1/2 in, FIP x FIP, Bronze
Part Number
4ALF4A33AM
Category
Potable Water Dual Check Backflow Preventers
Available to Order
Also known as:4ALF4A33AMAPOLLO
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.
Worldwide Shipping
Air & sea freight
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
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

APOLLO
Manufacturer Part Number
4ALF4A33AM
Type
FIP x FIP, Bronze
Pipe Size
1/2 in
Flow Rate
23 gpm
Connection Type
FIP x FIP

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

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

Product Description

The APOLLO Dual Check Valve with Atmospheric Vent (Model 4A, MPN 4ALF4A33AM) is a potable water dual check backflow preventer with a 1/2 in pipe size, FIP x FIP connections, a 23 gpm flow rate, and a bronze body.

Frequently Asked Questions

What is the APOLLO Dual Check Valve with Atmospheric Vent used for?

The APOLLO Dual Check Valve with Atmospheric Vent (Model 4A) is used in potable water systems to prevent backflow contamination. It is installed on residential or commercial water lines to protect drinking water from reverse flow caused by pressure changes, ensuring safe water supply.

What are the specifications of the APOLLO 4ALF4A33AM?

The APOLLO 4ALF4A33AM is a 1/2 in pipe size dual check valve with FIP x FIP connections, a 23 gpm flow rate, and a bronze body. It features an atmospheric vent for added backflow protection. These specs make it suitable for standard potable water backflow prevention applications.

Where to buy the APOLLO Dual Check Valve 4A worldwide?

3G Electric supplies the APOLLO Dual Check Valve 4A (MPN 4ALF4A33AM) to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this bronze backflow preventer.

How to install the APOLLO Dual Check Valve with Atmospheric Vent?

Install the APOLLO Dual Check Valve in the potable water line with flow direction matching the arrow on the bronze body. Use thread sealant on the FIP connections and ensure the atmospheric vent is unobstructed. Test for backflow prevention after installation per local plumbing codes.

Used in

Common applications for APOLLO
HVAC systems — Apollo bronze ball valves with FNPT connections for isolation of chilled and hot water lines.
Natural gas distribution — Apollo UL-listed bronze ball valves rated for gas service and 600 psi CWP.
Industrial process piping — Apollo stainless steel ball valves with spring-return handles for fail-safe shutoff.
Plumbing and potable water — Apollo brass ball valves with sweat connections for copper tubing installations.
Steam service — Apollo bronze ball valves with MPTFE seals and high-temperature ratings.
Backflow prevention — Apollo bronze ball check valves with RPTFE balls for inline flow control.
Not sure this is the right part? Photo-identify it→

APOLLO Products

3G Electric supplies APOLLO potable water dual check backflow preventers. 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 APOLLO

View all APOLLO parts →
APOLLO dual check backflow preventer for potable water systems. Features 1 in FNPT x FNPT connections, 24 gpm flow rate, and EPDM seals. Overall length 4.38 in. Used to prevent backflow in residential, commercial, and municipal water supply lines
APOLLO
APOLLO dual check backflow preventer for potable water systems. Features 1 in FNPT x FNPT connections, 24 gpm flow rate, and EPDM seals. Overall length 4.38 in. Used to prevent backflow in residential, commercial, and municipal water supply lines

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first