anybody used these

Octopus Neck Extension 200 SRO3000int/ext, XP2000sss/ext, NWB/DNWB200, XP3000int/ext/sss, DiabloXS200/225 | Premium Aquatics
http://premiumaquatics.com/products/octopus-neck-extension-200-sro3000intext-xp2000sssext-nwbdnwb200-xp3000intextsss-diabloxs200225.html