fol-da-tank|SKU:FGCLPR-4-NST-var-52192-ef8e0d

Fol-Da-Tank Clapper Valve — 6061T6 Aluminum Prime Maintenance

Maintain Prime Without Sacrificing Flow

Maintains prime consistently — Keeps pumper primed with low-level or floating strainers
Zero GPM reduction — Full flow output maintained through the valve at all times
6061T6 aluminum build — Industrial-grade tubing with AL-MAG castings for durability
Six thread configurations — Available in NST, NPT, BSP, STORZ, and CAM fittings
Four size options — Choose 4.0, 4.5, 5.0, or 6.0 inch to match your setup
  • FREE Pre-offer Spec Review -- We verify your thread type and size before you order
  • Ships Free -- LTL freight delivery included with every order

Price range: $639.00 through $1,269.00

30-day money back · No restocking fee

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Free Delivery Every order, every time.
Ships in 3–5 Days Heavy-duty crating included.
4.9/5 Stars 2,400+ verified reviews.

In the box

  • Fol-Da-Tank Clapper Valve (selected size and thread type)
Fol-Da-Tank Clapper Valve
Fol-Da-Tank Clapper Valve — 6061T6 Aluminum Prime Maintenance
$639.00 – $1,269.00Price range: $639.00 through $1,269.00

Maintain Prime Without Sacrificing Flow

The Fol-Da-Tank Clapper Valve maintains prime between your pumper and a low-level or floating strainer without reducing GPM output. Built-to-spec from 6061T6 aluminum tubing with AL-MAG castings, this field-proven valve handles the demands of sustained drafting operations. Available in 4.0 through 6.0 inch sizes with six thread type options including NST, NPT, BSP, STORZ, and CAM fittings. Ships free with full documentation. Financing available through Affirm.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
Zero GPM Loss
6061T6 Aluminum Build
6 Thread Options
Sustained Prime Hold
4.0–6.0 in
Size Range
6061T6
Aluminum Grade
6
Thread Type Options
Spec'd Correctly Before It Ships — No Wrong Thread Guesswork

Spec'd Correctly Before It Ships — No Wrong Thread Guesswork

The wrong thread type on a clapper valve means a pumper that can't connect to your strainer line — and a drafting operation that sits idle while you process a return. We verify your thread configuration, size, and strainer compatibility before the order ships. Select your required size from 4.0 to 6.0 inch and your thread type — NST, NPT, BSP, STORZ, or CAM — and we confirm it matches your existing setup. No guesswork, no mismatched fittings on delivery day.

Full GPM Output Without Prime Loss During Draft Operations

Full GPM Output Without Prime Loss During Draft Operations

The Fol-Da-Tank Clapper Valve maintains a continuous prime between your pumper and a low-level or floating dock strainer, even when water source levels drop. Unlike check valves that restrict flow, this valve allows full GPM passage without reduction — your pump operates at rated capacity throughout the entire draft. The 6061T6 aluminum tubing and AL-MAG castings deliver industrial-grade strength without unnecessary weight, making it field-proven gear for fire departments and municipal water operations where consistent flow is non-negotiable.

Six Thread Types Across Four Sizes for Exact Setup Matching

Six Thread Types Across Four Sizes for Exact Setup Matching

This clapper valve requires a 4-inch to 6-inch low-level strainer or floating dock strainer to function correctly. With four diameter options — 4.0, 4.5, 5.0, and 6.0 inch — and six thread configurations including NST, NPT, BSP, CAM, and STORZ with single or dual-end fitting choices, you can match your existing pumper and strainer connections exactly. No adapters, no compromised connections, no leaks at the coupling point. Select the configuration that matches your apparatus, and Tank Vault ships the correct spec.

Compatibility Check

Verify your setup before ordering to ensure a correct fit.

  • Strainer size between 4.0 and 6.0 inches
  • Thread type matches your pumper connection
  • Used with a low-level or floating dock strainer

Built for Drafting Operations

Where sustained prime and uninterrupted flow matter most.

Fire Department Drafting
Municipal Water Supply
Rural Fire Suppression

Full specifications

At a glance

Dimensions
4.0 inch, 4.5 inch, 5.0 inch, 6.0 inch
Full specifications6 data points across 4 categories

Dimensions

Available Sizes4.0 inch, 4.5 inch, 5.0 inch, 6.0 inch

Power & Performance

Flow ImpactGPM will not be lowered

Materials

Construction6061T6 aluminum tubing and AL-MAG castings
DesignAluminum

Compliance & Warranty

Thread TypesBSP, CAM, NPT, NST, STORZ - Both Ends, STORZ - One End
Returns30-day hassle-free (uninstalled, original packaging)

The Tank Vault Promise

Every order backed by straightforward policies — no runaround.

Free Shipping on Every OrderLTL delivery to your job site or facility — no minimums, no thresholds.
Free Compliance DocumentationAll applicable product specs and documentation included with your order.
30-Day Hassle-Free ReturnsIf it doesn't meet your spec sheet or arrives damaged, we resolve it immediately.
★★★★★
“Ordered the 5-inch NST for our pumper-to-strainer line. Prime holds solid even when drafting from shallow sources — no drop in GPM that we could measure. Tank Vault confirmed our thread type before shipping, which saved us from ordering the wrong configuration. Arrived on schedule, no issues.”
F
Frank L.Harrisburg, PA

The Fol Da Tank Clapper Valve maintains the prime between a pumper and a low level or floating strainer.

When pumping through this valve gpm’s will not be lowered.  

The valve is made with 6061T6 aluminum tubing and AL-MAG castings.

Clapper Valve Features:

  • Aluminum design.
  • Maintains prime between a pumper and a low level or floating dock strainer.
  • Requires: 4 inch to 6 inch sized low level strainer or floating dock strainer.

Choose from the following options:

Thread Size (inches):

  • 4.0
  • 4.5
  • 5.0
  • 6.0

Thread Type

  • NST
  • NPT
  • BSP
  • STORZ – Choose STORZ fitting with 1 end or both ends
  • CAM

Additional options:

  • Check other Fire Fighter Clapper Valve options or all Fol Da Tank options.

Additional information

Thread Type

BSP, CAM, NPT, NST, STORZ – Both Ends, STORZ – One End
Size

4.0 inch, 4.5 inch, 5.0 inch, 6.0 inch

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Frequently Asked Questions

It depends on your apparatus and strainer connections. NST is common on fire department equipment. NPT is standard for many industrial plumbing connections. BSP is used on some imported equipment. STORZ fittings are common on municipal fire apparatus. CAM locks are used in agricultural and industrial water transfer. Check your existing pumper intake and strainer fittings before selecting — or contact Tank Vault and we'll help you identify the correct thread type for your setup.
No. The Fol-Da-Tank Clapper Valve is designed to maintain full GPM flow while keeping prime between your pumper and strainer. Unlike restrictive check valves, this valve allows water to pass at full rated capacity without flow reduction. Your pump operates as if the valve isn't there — until you need the prime retention function during low-water or draft conditions.
Match the valve size to your low-level strainer or floating dock strainer. This clapper valve requires a strainer between 4 and 6 inches. If you're running a 4-inch strainer, select the 4.0-inch valve. For 5-inch strainer setups, choose the 5.0-inch option. Running mismatched sizes creates flow restrictions and connection problems. If you're unsure which size matches your current strainer, contact us with your strainer model and we'll confirm the correct pairing.
STORZ with one end means one side of the clapper valve has a STORZ coupling while the other side uses a different thread type — useful when your pumper intake and strainer use mismatched fittings. STORZ on both ends means both connections are STORZ couplings, standard when your entire draft line runs STORZ. Select the configuration that matches the fittings on both ends of your connection point.
The body is constructed from 6061T6 aluminum tubing with AL-MAG castings. This combination delivers industrial-grade strength with reduced weight compared to steel or brass alternatives. 6061T6 aluminum is widely used in fire and industrial equipment for its corrosion resistance and structural integrity under pressure. These are field-proven materials built to withstand repeated drafting cycles in demanding conditions.
Yes. Every Tank Vault order ships with the relevant product documentation for your records. For the Fol-Da-Tank Clapper Valve, this includes manufacturer specifications and material certifications. If your fire department or municipality requires specific documentation for equipment procurement or compliance records, contact us before ordering and we will confirm exactly what paperwork accompanies your shipment. No chasing the manufacturer after delivery.
Lead time varies depending on the size and thread configuration you select. Standard NST and NPT configurations in the most common sizes typically ship faster than STORZ or BSP options, which may have longer factory lead times. Contact Tank Vault with your required specification and delivery deadline, and we will confirm availability and ship date before you place your order. We arrange LTL freight nationwide and ships free to your location.
SKU: FGCLPR-4-NST Categories: , Brand:

The Tank Vault Promise

Every order backed by straightforward policies — no runaround.

Free Shipping on Every Order LTL delivery to your job site or facility — no minimums, no thresholds.
Free Compliance Documentation All applicable product specs and documentation included with your order.
30-Day Hassle-Free Returns If it doesn't meet your spec sheet or arrives damaged, we resolve it immediately.

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About fol-da-tank Clapper Valve

fol-da-tank is a trusted manufacturer of premium clapper valve. TankVault is an authorized dealer offering the full fol-da-tank lineup with free delivery, price match guarantee, and expert support.

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