Male-threaded 19 mm (3/4") end.
Air is evenly dispersed under the EPDM membrane and diffused via hundreds of precise holes in the membrane. A volume of 10 - 50 lpm of air is needed to successfully run the air disc; ensure you have a pump with adequate capacity for best results.
Below - fitted into the base of a fibreglass fish tank
Below - fitted into the side of a fibreglass fish tank
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