Castel Humidity Indicator Ø 1/2″ (Models 3940/4 & 3740/4)

€43.30

Tax included

€35.78 tax excl.

Calculate Shipping Cost

GDPR Compliance

Protecting your personal data

Shipping policy

Everything about shipping your order

Return policy

all the inns and outs about our return policy

Description

Ensure the health and efficiency of your refrigeration and HVAC systems with the Castel Ø 1/2″ Humidity Indicator. When moisture appears in your lines, the indicator turns from blue to pink/red, giving you an immediate, easy-to-read alert.

Instant Visual Alerts: Color-coded change for quick moisture detection.
½″ Standard Thread: Seamless fit into common refrigerant lines.
Robust Brass Construction: Resists corrosion and wear for long-lasting use.
Models 3940/4 & 3740/4: Designed for compatibility and reliability.

Rely on Castel’s precision-engineered humidity indicators to streamline maintenance, prevent moisture damage, and extend equipment life—order yours today.

Looking for similar items or different specifications for this Castel Humidity Indicator Ø 1/2″ (Models 3940/4 & 3740/4)?
Explore our full range in the Horeca, Refrigeration Fittings categories

* This part is compatible to the original part number. Part numbers are always leading.

Details

Brand Castel

Reference 59-159-3201040

Data sheet

Brand: Castel
Type: Compatible (non-original)

Review

Comments (0)

No customer reviews for the moment.

8 other product

Danfoss Humidity Indicator Ø 12 mm – SGN12S

Danfoss Humidity Indicator Ø 12 mm – Model SGN12S

Prevent moisture‐related issues in your refrigeration and HVAC systems with the Danfoss Humidity Indicator SGN12S. Its inline design for 12 mm tubing and vivid color‐changing window provide immediate visual feedback—from blue to pink—so you can address moisture before it causes corrosion or performance loss. Ø 12 mm Inline...

€77.55

Quick-view

Castel Nut 1/2″ SAE Ø 10 mm (Model 7030/4M10)

Ensure leak-free performance in your refrigeration and HVAC systems with the Castel 1/2″ SAE Nut, featuring a precise Ø 10 mm internal thread. Manufactured from premium brass and finished for corrosion resistance, this nut delivers a secure seal under demanding conditions. Precision Machining: Guarantees a tight, leak-proof...

€2.85

Quick-view

T-Fitting 1/4" SAE – Refco 9884811

The T-fitting 1/4" SAE is ideal for creating secure branch connections in refrigeration and HVAC systems. Designed for easy installation and a leak-free seal, this fitting is compatible with Refco 9884811 for commercial and industrial use. Features Connection: 1/4" SAE – 1/4" SAE – 1/4" SAE Reliable, leak-proof construction Simple installation...

€22.20

Quick-view

Castel Humidity Indicator ⅜″ MM SAE (Models 3910/33 & 3710/33)

Protect your refrigeration and HVAC equipment from moisture-related damage with the Castel ⅜″ MM SAE Humidity Indicator. Featuring a built-in color-changing window, it provides clear, immediate alerts—turning from blue to pink/red—so you can perform maintenance before system performance is compromised. Instant Visual Feedback: Color...

€30.09

Quick-view

Castel Nut 3/8″ SAE Ø 3/8″ (Model 7010/33)

Ensure secure, leak-free connections in your refrigeration and HVAC systems with the Castel Nut 3/8″ SAE, featuring a precise Ø 3/8″ internal thread. Crafted from premium brass and finished for corrosion resistance, this nut delivers dependable performance under demanding conditions. Precision Machining: Guarantees a tight, leak-proof seal. Standard 3/8″...

€2.24

Quick-view

Danfoss Humidity Indicator Ø ¼″ FM SAE – SGN6-014-0171

Danfoss Humidity Indicator Ø ¼″ FM SAE – Model SGN6

Prevent moisture-related issues in your refrigeration and HVAC systems with the Danfoss Humidity Indicator SGN6. Its inline design features a Ø ¼″ FM SAE connection and a vivid color-changing element that transitions from blue to pink when moisture is present, enabling fast, reliable maintenance checks. Ø ¼″ FM SAE Thread: Standard...

€69.52

Quick-view

Castel Double Swivel Sleeve US4-6 3/8″ SAE

Achieve hassle-free hose and tube routing in your refrigeration and HVAC systems with the Castel Double Swivel Sleeve US4-6 3/8″ SAE. Featuring two independent swivel ends, this coupling lets you align connections without twisting or stressing lines—ideal for tight or awkward installations. Dual Swivel Ends: Independent 3/8″ SAE...

€12.91

Quick-view

Castel Humidity Indicators ¼″ FM SAE – Models 3950/22 & 3750/22

Castel Humidity Indicators ¼″ FM SAE for Cooling Systems

Ensure moisture-free refrigerant flow in your cooling circuits with the Castel Humidity Indicators ¼″ FM SAE. These Italian-made indicators feature durable brass bodies and an integrated color-change sight glass for instant moisture detection. Features & Benefits Dual Models: 3950/22 & 3750/22 to suit system preferences Standard ¼″...

€29.48

Quick-view

join our Newsletter now

You may unsubscribe at any moment. For that purpose, please find our contact info in the legal notice.

contact info

Brooks Parts
H.R. Holsterf 288
3315TK Dordrecht
Netherlands
(no visiting adress)
info@brooksespressomachines.com

Products

Our company

Your account

This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.

More information Customize cookies

Functional cookies

Yes

Description and cookies

Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.


PHP_SESSID	brooks-parts.com	The PHPSESSID cookie is native to PHP and allows websites to store serialised status data. On the website it is used to establish a user session and to pass state data through a temporary cookie, which is commonly known as a session cookie. These Cookies will only remain on your computer until you close your browser.	Session
PrestaShop-#	brooks-parts.com	This is a cookie used by Prestashop to store information and keep the user's session open. It stores information such as currency, language, customer ID, among other data necessary for the proper functioning of the shop.	480 hours

Advertising Cookies

Yes

Description

These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.

Analytics cookies

Yes

Description

Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.

Performance cookies

Yes

Description

These are used to improve the browsing experience and optimize the operation of the shop.

Other cookies

Yes

Description

These are cookies without a clear purpose or those that we are still in the process of classifying.