Inner Diameter 1 1/4': Automotive, Inner Diameter 1 1/4": Heater - ✓ FREE DELIVERY possible on eligible purchases. Gates 28445 Green Stripe Heavy-Duty Straight Heater Hose-50' Length. heavy-duty construction, The advanced EPDM tube, bus and off-road equipment heater systems, Buy Gates 28445 Green Stripe Heavy-Duty Straight Heater Hose-50' Length, Green Stripe construction provides best cost-per-mile economics. Reduces water loss from water permeating the hose wall and cover. Gates Green Stripe Heavy-Duty Heater Hose provides the best cost-per-mile economics for your truck, With abrasion resistant, Class D-1 tube and cover Standard Wall. Exceeds SAE 20R1 Type EC, cover and reinforcement withstand high under-hood and coolant temperatures; designed and tested for extended use without cracking or hardening, Abrasion-resistant cover, Engineered with materials to resist electrochemical degradation.