Often called the Adjustable Zipper/Piping Foot
The piping foot will have its limitations when using thicker piping including the heavy jumbo cord and this is when the adjustable zipper foot will be invaluable. A screw on type foot, it can be adjusted to fit snugly against the cord when covering your own piping or when attaching commercial piping.
These feet will fit
Top Loading, Short Shank, Snap on Feet
230/360DC, 521, 525S, 625E, 659, 725S, 740/780DC, 2522LE, 4018, 4023, 4035, 4052, 4052, 4300QDC, 4618, 4623, 5018, 5024, 5030, 5050, 5060QDC, 5124,5270QDC, 6019QC, 6125QC, 6260QC, 7025, 8050XL, 8077, CXL301, DC3050, DC4030, DC4100, DKS30, DKS100, DXL603, GD8100, HD2200, JEM GOLD/660, JEM GOLD2/661, JEM GOLD+/661C, JLX2000, JP720, JP760, JUBILEE85, M50QDC, M100QDC, M200QDC, MC4800, MC4900QC, MC5200, MC5900QC, MC6500P, MXL50, MYSTYLE 22/2522, QXL605, SL30X, TXL607, XC50, XL30, XL601, XR33/XC33.
DUNELM:DM300, DM200
JOHN LEWIS:5024, 5030, 5050, 7025, DC3050, DC6030, DC7100, DEX30, M30A