Rupture-resistant rubber hose could be used with 1 1/4", 1 1/2", 1 3/4" or 1 5/8" radiator necks Specifically optimized for use with our products The product includes: Explosion-proof rubber sleeve x2, 1/4" Rubber Adapter x2,1-1/2"Rubber Adapter x2,1-3/4"Rubber Adapter x2,1-5/8"Rubber Adapter x2 Stainless Steel Radiator Flexible Coolant Water Hose Kit Adapter Not Prone to cracking, breaking and other problems