Murray (KS3271) or Oetiker brand.

3/4" Crimp Clamp

Link to Murray Clamp Specs

Keystone Pinch Clamps are welded and are quick and easy to install, andprovide a uniform, tamper proof seal. They are widely used on both softhose and rigid plastic pipe. You will find these clamps anywhere youconnect poly pipe. Ear clamps are excellent for use in a multitude ofirrigation and water supply systems, on fuel and vapor lines, to attachdust shields and air filters, for beverage supply lines, for car wash supplylines, and for securing bundles of cable. When crimping with a hand tool,Murray's true Keystone geometry, located in the ear area, dramaticallyreduces miscrimps. Keystone Pinch clamps are 100% Stainless Steel.