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Cast-iron union for circulator pumps (1 unit; 2 per pump)

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Regular price€2,68
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Tax included. Shipping calculated at checkout.

  • 4 in stock
  • Backordered, shipping soon

At Q-TECH, we apply the same clear rules for everyone: the law protects you, and when applied correctly, it protects us as well. By processing your purchase, you accept our General Terms and Conditions of Sale. If you are purchasing as a consumer (B2C), nothing stated herein limits the rights granted to you by mandatory law (RDL 1/2007, TRLGDCU): the 3-year legal warranty of conformity and the right of withdrawal under the terms and with the exceptions legally provided, which are detailed below. References to "B2B" apply only to businesses and professionals.

Your guarantees

  • Rights intact: 14 days of withdrawal from receipt for most products—subject to the legal exceptions you will see below, such as goods made to your specifications—and a 3-year legal warranty of conformity, under the terms of the TRLGDCU.
  • Conformity with the description: we guarantee that the equipment will correspond to the published technical description and what one could reasonably expect from it (arts. 115 et seq. TRLGDCU). Images and videos are for guidance only: the manufacturer may supply a more recent revision of the product or introduce minor aesthetic, packaging, or firmware changes, without this constituting a lack of conformity as long as the described characteristics and performance are maintained.
  • Traceability that also protects you: we document the condition, serial number, and seal of each piece of equipment upon shipment, and we video-record the opening of returns; this is your proof of the condition in which the goods were delivered.

Responsible use and your part

  • If you are thinking of returning it, keep it as you received it: without installing or activating it, with its seals, accessories, and packaging intact. This is how to ensure a full refund, without deductions.
  • Handling that exceeds inspection reduces value: handling the equipment beyond what is necessary to verify its nature and operation may result in a real, assessed, and case-by-case justified deduction (art. 108.2 TRLGDCU), never a fixed percentage. In particular: activating or registering the serial number, linking it to a manufacturer's account or app, circulating water through hydraulic equipment, unsealing probes, or installing software or consumables. Initial inspection of the product does not lead to a deduction.
  • The same item must be returned: withdrawal requires returning the supplied unit. Different equipment, or equipment with prior use, age, or wear prior to purchase, does not constitute a valid withdrawal.
  • Installation and cybersecurity, shared responsibility: this is technical hardware; you are responsible for correct installation, credentials, patches, and backups, while we deliver a compliant product. Q-TECH is not liable for damages resulting from poor installation, incorrect configuration, or omission of patches by the customer or third parties (in B2C, without prejudice to the legal warranty and liability for intent or negligence, arts. 86 and 130 TRLGDCU).
  • Delivery of bulky goods: delivery is made to the curb. B2C: transport risk is ours until physical delivery (art. 66 ter); we recommend noting visible damages on the delivery note and notifying us of breakages within 24-48 hours with photographs to activate the insurance. B2B: inspection and notation on the delivery note are mandatory; hidden damages must be reported within 24 hours (art. 366 CCom). Unjustified rejection or incorrect shipping information will entail the actual outbound and return costs (approx. €85-550 for heavy machinery).

Made to your measure (Advanced Pre-Assembly)

  • If your order includes equipment, racks, hydraulic assemblies, or technical rooms made or configured according to your specifications (permanent joints, custom cuts or wiring, parameterization, pressure testing), these are custom goods without the right of withdrawal from the conclusion of the contract (art. 103.c TRLGDCU; CJEU Case C-529/19), which is informed before purchasing and documented in the signed Order Note. A test you request without permanent modification retains your right of withdrawal, with only the actual loss of value caused by that test being deducted. Would you prefer to receive it tested, configured, and ready to connect, without assuming these risks? Contract our Advanced Pre-Assembly or the prior technical audit.

If you are purchasing as a business or professional (B2B)

  • The transaction is governed by the Commercial Code: firm sale, without the right of withdrawal; notification of defects within 4 days (apparent) / 30 days (hidden), arts. 336 and 342. Q-TECH acts as a distributor and excludes indirect damages, loss of profit, and data loss, limited to the price of the equipment, without prejudice to the manufacturer's commercial warranty.

Product warnings v1.0 · June 2026. Information summary; the complete and binding conditions are those published at q-tech.es.

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Cast-iron union to connect a threaded circulator pump to the pipework

The cast-iron union connects one port of a threaded circulator pump to heating or cooling pipework. Sold individually: each pump needs 2, one per port. Two sizes to match the pump thread: 1½" × 1" and 2" × 1¼". At Q-Tech we use them when fitting or replacing circulators in pre-assembled plant rooms.

Summary

TypeCast-iron union for circulator pumps (1 unit)
ReferenceSalvador Escoda AC52920 and AC52921
UseConnecting threaded circulators in heating and cooling systems
Sizes1½" × 1" and 2" × 1¼" (pump thread × pipe thread)
Quantity per pump2 units
Q-Tech installationPump fitted in a pre-assembled plant room or on site by an Expert Technician

What is a circulator union?

Threaded circulators have a large male thread on each port (1½" or 2"). The union has a nut that screws onto the pump and a tail that screws onto the pipe, with a flat gasket between them. The pump can then be removed without cutting pipe.

What problem does it solve?

Pumps do not come with unions, and the pipework is usually a smaller size than the pump port. The cast-iron union is the economical choice for closed heating and cooling circuits.

Sizes and compatibility

SizePump threadPipe threadDAB pumps in our storeSE reference
1½" × 1"1½"1"EVOSTA 2, EVOSTA 3 and EVOSTA 2 SOL 130 and 180 mm; EVOPLUS Small 180 mmAC52920
2" × 1¼"2"1¼"EVOSTA 2, EVOSTA 3 and EVOPLUS Small 180X; ALM 500 and ALP 2000AC52921

Compatibility and limits

  • Order 2 units per pump.
  • Do not use it for domestic hot water: for DHW, choose the brass union set.
  • Not for flanged pumps (EVOPLUS B, KLP, KLM).
  • The photo shows 2 units with their gaskets.

Frequently asked questions

How many do I need?

Two per pump, one on each port. The price is per unit.

How does it differ from the brass one?

The brass one is also suitable for domestic hot water and is sold as a set of 2. The cast-iron one is for heating and cooling.

What is the delivery time?

It is in stock at our warehouse; if none were left, we would order it urgently and tell you the lead time.

Q-Tech installation and support

Q-Tech fits circulators with their unions in our pre-assembled plant room, which arrives tested and ready to connect. To replace a pump in your system, book an on-site Expert Technician by the hour; if you are unsure of the size, request a technical call. Pumps in DAB circulator pumps.

Availability and lead times: this item is in stock at our warehouse. Occasionally, depending on the time of year, the stock update may contain an error. If no units are available when you place your order, we will order it urgently and inform you immediately of the updated delivery time.

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