找到了，是不是这个啊？

https://www.homedepot.com/p/Shur-Line-6-in-x-3-in-Deck-Stain-Pad-with-Groove-Tool-1791257/203227759

https://www.homedepot.com/p/Shur-Line-9-in-Tear-Resistant-Deck-and-Stain-Pad-Refill-2006127/202080288?MERCH=REC-_-PIPHorizontal3_rr-_-203227759-_-202080288-_-N