is 2 , open or closed. The hand is four triplets or quads and a pair. A sequence removes it.
The name players use is toitoi (対々和). This site's glossary also lists it as All Triplets. The long reading is toitoihou.
Triplets of 2 man, 4 man, and 3 pin are finished. The hand waits on or . makes the fourth triplet and leaves a pair of 5 sou. makes the fourth triplet and leaves a pair of 6 pin. Every tile is 2 through 8, so this hand is also tanyao.
A is a sequence, so the yaku is gone. A or a keeps it. A quad counts as a triplet.
Closed or open
The EMA 2016 list files all pungs with the 2 han yaku. It does not add a han when the hand is concealed. The glossary entry says the same thing: 2 han, four triplets or quads and a pair, and no sequences.
A that wins by on one of two pairs still scores this yaku at 2 han. The triplet you complete on that discard counts as open. When the other three triplets were concealed, the hand also has sanankou.
are suuankou, a , when you win by tsumo or by ron on a . That hand is not scored as 2 han.
What 2 han 30 fu pays
An open toitoi of simple triplets, with a wait on either of two pairs and a pair that is not yakuhai, is 28 fu. That rounds up to 30. At 2 han 30 fu, a ron collects 2,000. The dealer collects 2,900. Those payments have no and no sticks.
A call does not change the han. A closed hand is still 2 han from this yaku before and before any other yaku.
A different hand
is chiitoitsu: 2 han, closed only, and the fu stays at 25. Toitoi is triplets, and the hand can include calls.
Price a toitoi hand
The score calculator turns 2 han 30 fu, an open toitoi of simple triplets, into 2,000 or 2,900.
Open the score calculator