Sibop bisiklet pompasına bağlandı.

It follows a very common Turkish pattern:

subject + complement + verb

• Sibop = the valve
• bisiklet pompasına = to the bicycle pump
• bağlandı = was connected / got connected

Turkish usually puts the verb at the end, so this word order is normal and neutral.

Because bisiklet pompası is a noun compound meaning bicycle pump.

In Turkish, compound nouns like this are often built as:

noun + noun + -(s)ı/(s)i/(s)u/(s)ü

So:

• bisiklet = bicycle
• pompa = pump
• bisiklet pompası = bicycle pump

Then the dative ending -a / -e is added because the meaning is to the bicycle pump.

So the full build is:

• pompa
• pompası
• pompasına

That -n- appears as a buffer consonant before the case ending.

Not necessarily. In this sentence, pompası is most naturally just part of the compound bisiklet pompası = bicycle pump.

This is important because the same ending can look like a possessive ending in other contexts. But in compounds, it often does not mean literal possession.

So here:

• bisiklet pompası = bicycle pump
  not necessarily
• the bicycle’s pump in a literal ownership sense

Because bağlanmak commonly goes with the dative when it means to be connected to or to attach to something.

So:

• bir şeye bağlanmak = to be connected to something

That is why you get:

• pompasına = to the pump

This is similar to English connect to, where the preposition is part of the verb pattern.

Bağlandı comes from bağlanmak.

A useful way to see it is:

• bağlamak = to tie, connect, attach
• bağlanmak = to be tied/connected, to get attached

Then:

• bağlandı = was connected / got connected

Yes, it often has a passive-like meaning in English. But in Turkish, -n- forms like this can be passive, middle, or intransitive depending on context.

So bağlandı does not tell you who did the connecting. It only tells you that the valve ended up connected.

Because Turkish is normally a verb-final language.

The most neutral order is often:

subject + other information + verb

So:

• Sibop bisiklet pompasına bağlandı.

sounds natural and standard.

Turkish word order can change for emphasis, but the version you have is the ordinary default.

Turkish does not have articles like English a and the.

So a noun like sibop can mean:

• a valve
• the valve

The exact meaning depends on context.

In a sentence like this, English usually needs an article, but Turkish does not.

This is because of vowel harmony and consonant voicing.

The past tense ending has four vowel forms:

• -dı
• -di
• -du
• -dü

The verb stem here ends in a back vowel sound, so the correct form is -dı:

• bağlan + dı = bağlandı

It uses d rather than t because the sound before it is voiced.

In modern Turkish, ğ usually is not pronounced like a hard English g.

In bağlandı, it mainly affects the vowel before it, often making it longer or smoother. So it sounds roughly like:

• baan-dı or baa-lan-dı depending on speed and accent

The important point is: do not pronounce it like the g in go.

Yes. English can translate bağlandı in more than one way:

• was connected
• got connected
• became attached

Which one sounds best depends on context.

If the focus is just the completed result, was connected is common.
If the focus is the change of state, got connected may feel more natural.