Additional Images

Stainless Steel Triple Seal Duramax Heater Core Fitting 3/4" Inlet 5/8" Hose

800-409HP - 11A
Pricing: $19.99


Replace your brittle, broken or leaking plastic heater core quick connect fitting with this stainless steel option from DHD. This stainless connector has triple the sealing provisions and features stainless internal locks for a leak free permanent replacement. If your tackling a head stud, head gasket or major service on your truck, do yourself a favor and add this to your cart! Our DHD shop techs love them.


  • Improved design - this HVAC heater hose connector has been redesigned for greater durability the original equipment part
  • Durable construction - this heater hose connector is made of stainless steel instead of the original equipment connector to reduce damage from heat fatigue and vibration
  • Easy to install - matches the original equipment form and dimensions for a simple replacement
  • Quality tested - this part has undergone try-on, corrosion, heat and pressure testing to ensure a quality fit and long service life


Works on all Duramax/GM trucks utilizing a 3/4" tube, 5/8" Hose quick connector at the heater core. Pair this fitting with DHD 500-304 heather core fitting to provide a high quality, leak free, clean install.

Replaces GM Numbers:


Shipping Information

  • Item Requires Shipping
  • 1.0 lbs.
  • W7.0000” x H5.0000” x L4.0000”

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.