It looks like you're asking about a P7 3/4" joiner with the code 07-P.712. Here are some details about this type of joiner:

• Material: Made of brass alloy, which offers durability and corrosion resistance
• Connections: Designed with barbed ends to fit 3/4" internal diameter (ID) hoses
• Applications: Suitable for use with air, water, and other fluids
• Features: Double-ended tail for secure hose connections