Abstract: An improved apparatus for insulating outside water faucets during cold weather including a rigid eliptical plastic shell, an end seal and a fastening means which is a two-piece pawl and ratchet type fastener having the pawl in a separate retainer and the ratchet on a strap with a loop in one end so that the end seal is fixed over the pipe extending from a wall, the strap is placed through a slot in the shell and through the retainer and the looped end hooked over the faucet, then the strap is held in one hand and the retainer and shell are pushed tight to the wall placing the strap under tension, the shell and end seal in sealing relationship with each other and the wall until released by depressing the pawl.