Check the listing for details. Replacement 10" Single Membrane Diffuser for QS1 QS2 DSW1 DSW2 DS1 DS2 3/4"PT. Condition: New. Listed at 52.00 USD. BRAND NEW Single MEMBRANE DIFFUSER REPLACEMENT Head unit.Membrane Diffuser Feature:10" in DiameterA great alternative to air stones in many aeration applicationsHundreds of "I" slots that open as air pressure builds inside of the diffuserCenter of the membrane does not have slots and acts as a check valve when air flow stopsDiffusers have a 3/4" male thread inlet and are 10" in diameterHeavy duty membrane will last for yearsUniform bubble distribution with up to 3 CFM air flowReplaces any existing torn or defective diffusers on most manufacturer bases. Such as the EasyPro QS1, QS2, EPMD1, EPMD2, EPMD4, Blue Diamond and KamAir DSW1, DSW2, DS1, DS2, Matala MDB11, MDB22, etc. OR you can build your own base or simply plumb into PVC to create your own Diffused air set up.