Bulkhead

Typical bolt and nut type of bulkhead fitting, unscrewed, showing rubber gaskets.

Introduction

These fittings are used to get water through the side or base of a tank. They are essentially just a large plastic bolt and nut, with a hole down the middle of the bolt.

If these are sourcing from a plumbing store, then do not ask for a "bulkhead" as they will not know what you are referring to. They will refer to them as Tank Fittings or Tank Outlets.

Usage

Bulkheads are typically used in conjunction with or to form the following, all which require water to pass through the side or base of a tank:

• Weir and/or Overflow
• Standpipe
• Closed Loop

They are designed so that the female section of the fitting goes on the inside of the tank, best, least likely to leak configuration.

Dimensions

The dimensions shown here apply to the these types of bulkhead fittings only.

Required Hole Size

The minimum hole size required to accommodate the bulkhead fittings are as follows:

• 15mm/0.5" - 21mm thread OD = 24-26mm hole
• 20mm/0.75" - 26mm thread OD = 30-32mm hole
• 25mm/1" - 34mm thread OD = 36-38mm hole
• 32mm/1.25" - 43mm thread OD = 45-47mm hole
• 40mm/1.5" - 49mm thread OD = 51-53mm hole
• 50mm/2" - 61mm thread OD = 63-65mm hole

Flange Diameter

The outside diameter of the flange section of both the bolt and nut are as follows:

• 15mm/0.5" - 57mm
• 20mm/0.75" - 64mm
• 25mm/1" - 73mm
• 32mm/1.25" - 84mm
• 40mm/1.5" - 92mm
• 50mm/2" - 105mm

Gallery

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  Threaded connection type
• 
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  Female side on inside of tank
• 
  Pipe connection type
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  Accessories: Strainer and hose tail