This kit contains everything to rebuild the inside of the S, SW, VG2, Low profile series pumps: Bellows Clamps must be used to upgrade older style black bellows to new style.
1.385310076 - 2 packs of 1 1/2" duck bill valves
2.385230980 - Bellows (newly redesigned grey arm / bottom)
3.385310151 - O-Rings 8 bolt style
4.385311226 - Bellows Half Clamps