Brand: Billet Specialties Manufacturer's Part Number: BLK90900 Part Type: Water Necks and Thermostat Housings Product Line: Billet Specialties Thermostat Housings Automotive Fittings Part Number: BSP-BLK90900 UPC: 800770109060 Water Neck Style: Straight Swivel: No Material: Aluminum Color: Black Coating Type: Anodized Sealing Style: O-ring Water Neck Inlet Size: -16 AN Thermostat Included: No Mounting Hardware Included: Yes Heater Bypass Provision: No Quantity: Sold individually. Notes: For use on GM LS series water pumps that use a separate thermostat and water neck housing or Edelbrock LS water pumps. Description: Billet Specialties thermostat housings not only look good, but they also get rid of leaky paper gaskets thanks to their O-ring seal design. You can choose the conventional vertical housing or the high-tech 360 degree swivel housing. They're available straight-up or with a 0, 15, or 45 degree angle and come complete with stainless hardware.