Hayward Diffuser, 2-1/2 HP and 3 HP | SPX3021B Jack's Magic The grate sits in the

The grate sits in the drain opening to allow water entry while acting as a protective surface

A proper adapter helps ensure the vent system mates correctly without gaps that can leak exhaust

Closes an opening or service port

and fewer pump-related issues with this essential pool upgrade

and operating logic

Hayward Diffuser, 2-1/2 HP and 3 HP | SPX3021B Jack's Magic The grate sits in theWhat This Part Is Used For The Hayward SPX3021B is a diffuser used in compatible 2 1 2 HP and 3 HP pump models. It surrounds the impeller inside the wet end and directs water into the pump housing. This component manages internal water flow. Why This Part Matters A cracked or warped diffuser can reduce efficiency and lower system pressure. Poor internal flow control may affect heater performance and filtration. Replacing a worn diffuser restores