cushion
Isaac Kremer/ January 14, 2018/ / 0 comments
In plumbing, air pocketed beyond and above a faucet or valve, to obviate water hammer. Photo from Metuchen, New Jersey, 2020. 2. A cap for protecting a pile head as well as the pile hammer during a driving operation. Also called cushion block, cushion head. (Saylor, 1952)
cushion block, cushion head