HUB Parts › Water Heater PTF Coupling (Legacy) Image 1 of 2 Image 2 of 2 Water Heater PTF Coupling (Legacy) $14.00 Quantity: Add To Cart Added! This fitting assembly is installed on the water heater.Quick connect design enables an easy connection to the faucet. This fitting assembly is installed on the water heater.Quick connect design enables an easy connection to the faucet.