Hole distances: 2-5/8 center to center between outer holes. 1-7/8 from center hole to outer holes. Homelite OEM Part 308653071 Valve part 678169004 Also replaces obsolete 309515001 Bolts directly to gas engines up to 6.5hp (horizontal shaft only) 2.5 gpm 3100 psi (w/6.5 hp) 3/4 Hollow shaft (Most common shaft size on horizontal gas engines up to 6.5 hp) 22mm Twist Couple Type Discharge fitting Filled With Oil Chemical Injector.Please check out your address carefully when processing order. We care about our valued customers, and will always try to help you. Please give us the opportunity to resolve any problem. We understand the concerns and frustrations you might have, and we try our best to resolve the problem. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Pressure Washers". This item can be shipped to United States.