Instalatorul verifică racordul flexibil.

Because Romanian usually puts the definite article at the end of the noun, instead of using a separate word like English the.

So:

• instalator = plumber
• instalatorul = the plumber
• racord = connector / fitting / coupling
• racordul = the connector / fitting / coupling

For many masculine and neuter singular nouns, the definite ending is -ul.

Verifică is the present tense, 3rd person singular form of a verifica = to check / inspect.

A few forms:

• eu verific = I check
• tu verifici = you check
• el/ea verifică = he/she checks
• noi verificăm = we check
• voi verificați = you (plural) check
• ei/ele verifică = they check

So in this sentence, instalatorul verifică means the plumber checks / is checking.

Romanian present tense can often translate as either English checks or is checking, depending on context.

Because Romanian uses a postposed definite article: the article is attached to the noun itself.

So instead of:

• English: the plumber
• Romanian: instalatorul

And instead of:

• English: the flexible connector
• Romanian: racordul flexibil

This is one of the biggest structural differences between English and Romanian.

In Romanian, the normal, neutral position for an adjective is after the noun.

So:

• racord flexibil = flexible connector
• racordul flexibil = the flexible connector

This noun + adjective order is very common in Romanian.

You can sometimes put an adjective before the noun, but that usually sounds more literary, emphatic, or stylistically marked. The most natural everyday order here is racordul flexibil.

Because the noun carries the definite article here, not the adjective.

In racordul flexibil:

• racordul shows definiteness: the connector
• flexibil simply describes the noun: flexible

The adjective still agrees with the noun in gender and number, but it does not normally take the definite ending in this basic structure.

Compare:

• racord flexibil = a flexible connector
• racordul flexibil = the flexible connector
• racorduri flexibile = flexible connectors
• racordurile flexibile = the flexible connectors

Racord is a neuter noun.

In Romanian, neuter nouns behave:

• like masculine in the singular
• like feminine in the plural

So you get:

• un racord
• racordul
• două racorduri
• racordurile

That is why the singular form here looks masculine.

Because the subject is already stated: instalatorul.

Romanian does not need an extra subject pronoun when the subject noun is present. In fact, even when the subject is only a pronoun, Romanian often leaves it out if the meaning is clear from the verb form.

So:

• Instalatorul verifică racordul flexibil. = The plumber checks the flexible connector.
• Verifică racordul flexibil. = He/She checks the flexible connector. (depending on context)

Romanian is often a pro-drop language, meaning subject pronouns can be omitted.

Yes.

Romanian present tense often covers both:

• checks
• is checking

So verifică can mean either one, depending on context.

If you want to stress an ongoing action more clearly, Romanian can also use structures like este în curs să verifice or other context-dependent wording, but in normal everyday language the simple present often does the job.

Yes. If you wanted to say a flexible connector instead of the flexible connector, you would say:

• Instalatorul verifică un racord flexibil.

So the difference is:

• racordul flexibil = the flexible connector
• un racord flexibil = a flexible connector

Your original sentence uses the definite object, so it refers to a specific connector.

The letter ă is pronounced like a short, neutral vowel, similar to the a in English sofa.

So verifică is approximately:

• veh-ree-FEE-kuh

with the stress on fi.

A rough pronunciation of the whole sentence is:

• in-sta-la-TO-rul ve-ree-FEE-kuh ra-KOR-dul flek-see-BEEL

This is only an approximation, but it is a useful starting point.

Yes, but the original order is the most neutral and standard:

• Instalatorul verifică racordul flexibil.

Romanian can change word order for emphasis or style. For example, if you want to emphasize the object, you might see something like:

• Racordul flexibil îl verifică instalatorul.

That sounds more marked, something like:

• It is the flexible connector that the plumber is checking.

So for normal, straightforward description, the original sentence is the best model.