Bought this adapter (DEC 2013) to use with my Duromax XP4400E generator (purchased 2010). Had previously been using 2-120v outlets to run test appliances up to 1400w total, with gennie-switch set on 120v. Y-Adapter plugs in fine (it IS heavy duty!) into the L1430 plug, gennie switch set to 240v, lights on two splitter 120v ends lit up perfectly. Ran two separate "legs" of (a)1325w and (b)1350-1500w from the 2 plugs of the Y-Adapter. This adapter is AMAZING. Taking full advantage of the generator's power is critical. I did NOT attempt to max-out its potential of 1750w per "side" (3500 running watts total.) At one point the gennie really groaned, and "loaded-Up" until I stabilized the load, but then ran fine. That's the generator, not the adapter. If you really want to take full advantage of your generator's potential power using its 30-amp L1430 plug, get one of these adapters. The locking plug is essential if you're using a gen-cord-to-transfer switch, but using this adapter and heavy duty (12 ga.) extension cords and power strips will provide for portability, and maximum-emergency-power use. Wattages were monitored using Reliance AmWatt meters THP103 (yup, Amazon,) on each leg, allowing for balancing of the load, which is very important. This Y-Adapter works, and allows you to max-out the power potential of your generator's 30-amp L1430 plug. I highly recommend it. I hope I never have to use it. Better to have it, and not need it.... Great Product! Thanks Conntek! Thanks Amazon! UPDATE: 3/16/14: Well... I had to use it... And I'm glad I did! The central Wyoming blackout of 3/14-15/2014 went on for 7 hours. Seems a "critter" crawled into an electrical sub-station, got "fried," and turned out most of the lights across the entire town!... After the first 30-minutes of no lights, I thought "OK, here we go!" Fired up the gennie, plugged in the Conntek Y adapter, ran my extension cords, and never worried about the loads. Freezer, wood stove & some lights on one side, fridge and some lights on the other. Never a whimper... Sure glad I bought it... Peace of mind... Full generator power... When you need it the most! Thanks again, Conntek... And Amazon...! UPDATE: 12/11/14:: Price has jumped $2.00 in one year from $29.12 to its present. If you're thinking about it, ya better get one now, before they're all gone, or out of your price range. jus sayin'....