If you need them (like me, for hooking up an RV) they're great. I think I found them at Home Depot for $40 each. I made it myself for a lot less money and it worked great!
Leviton 2711 Industrial Grade 30 Amp Locking Plug - NEMA L14-30P, 125/250 Volt, Grounding, Black-White
9 Review
Enhance Your Home Automation with TP-Link π KP100KIT Kasa Wi-Fi Smart Plug Slim Edition 2-Pack
8 Review
π WELLUCK 15 Amp Flanged Inlet 125V β Waterproof RV Shore Power Inlet Plug: Ideal for Marine Boats, RVs, Sheds & Generators
9 Review
π© LSD85124 Yellow Wet Noodle and Retriever - Intelligent Labor-Saving Device
9 Review
β‘οΈ Sunpark LC-12014T (1) FC12T9 32W Circline (1) 2D 38W (1) FC16T9 40W Circline (1) FC9T9 30W Circline Lamp Compact Electronic Fluorescent Ballast with Circline Lamp Plug 120V
7 Review
Wireless Electronic Ballast Interface Certified
8 Review
Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review
π‘ Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review