NL50 99 3bet pot turn

Hand converted with online PokerStrategy.com hand converter:

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$0.25/$0.5 No-Limit Hold'em (6 handed)

Known players:
[tg]CO$28.51:///////;BU (Hero)$48.82:///////;SB$101.38:///////;BB$59.90:///////;MP2$81.47:///////;MP3$50.00:///////;[/tg]

Preflop: Hero is BU with 9:s, 9:d.
3 folds, Hero raises to $1.12, SB raises to $3.50, BB folds, Hero calls $2.38.

Flop: ($7.5) T:d, 7:h, 7:s (2 players)
SB bets $4.25, Hero calls $4.25.

Turn: ($16) 4:c (1 players)
SB checks

Villain 8.1k hands
20/17/7
3bet SB vs steal 11%
3bet vs open BU 11%
cbet in 3bet pot flop and turn: 82%/37%
c/r turn 7% (overall, not in 3bet pot only)
WTSD 23%
WWSF 41%

I have always some doubts in these spots, I want to protect my equity but I don't wanna get check/raised, although my opponent doesn't seem like that type.