Three part internal rides behind jets in body to allow flow control when jet face is turned left or right.
Gasket typically degrades after a few years and air draw fails, or gasket clogs flow path.
TIP: To remove, use an open pair of needle nose pliers to unscrew black ring. Two slots in ring need to be open upon re-insertion to allow jet 'feet' to penetrate through them to facilitate on/off valving feature of this jet.
Lubricate clear gasket with silicone grease or equivalent when installing.
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