Skywalker Leg Extention 4144 ATC15B Authentic Skywalker Trampoline Part. Part Identification: Leg Extension. Key # 3 Fits: Skywalker 15' ROUND Replacement Part Sold in quantities of ONE. (Twelve (12) are needed to complete the trampoline.) Fits Models: SWTC1500, SWTC1511, SWTC1514, SWTC1515, OWTC15 21" Length