Spears TAW Series PVC Wrench for Bulkhead Tank Fittings, 1" Bulkhead wrench set for tightening a bulkhead tank fitting Body wrench and nut wrench slip onto fitting for manual tightening PVC for corrosion resistance, high strength, and less weight than metal Wrench set for manual tightening of body and nut Meets ASTM 1785 for quality assurance and NSF certification for potable water