If the centre burner cap on your wok burner is looking a bit worse for wear or is damaged in any way, you should replace it as soon as possible as it acts as protection for the burner itself.
C659P(X)UK, PF750AST(IX), PH640MST(BK), PH640MST(OW), PH640MST(SS), PH640MST(WH), PH941MSTB, PH941MSTV, PH960MST, TD740MST(BK), TD740MST(WH), TD740MSTICE, XP90G
S860GX
G310X, GC750TX, GD74C, GD74I, GD74K, GE740TCX, GF640K, GF640K., GF640N, GF640T, GF640TX, GF640W, GF640W., GF640X, GF640X.
K647GS(X)/G, KP9507EB(X)G, KP9507XE/G, P640ASTIX, P640TC(IX)GB, P640TCIXGB.1, P750AST(IX), PI640AST(IX), PI640TC(IX), PI750AST(IX), PIM640ASTIX, PIM640ASTIXC, PIM750ASTIX, PIM750ASTIXC