(Sole Source – Dibert Fitting & Valve Co., Inc.) Please refer to all attachments for detailed specifications and required materials. This requirement is sole sourced to Dibert Fitting and Valve Co., I... (Sole Source – Dibert Fitting & Valve Co., Inc.) Please refer to all attachments for detailed specifications and required materials. This requirement is sole sourced to Dibert Fitting and Valve Co., Inc. The material is uniquely designed and manufactured to fit equipment used within the shipyard and cannot be procured from alternate sources. No bids or quotes will be accepted. This notice is provided for informational purposes only.