4" TTMA Sightglasses and Flanges

The BF4 series of sightglasses and flanges are made to suit 4" TTMA flanges/piping. 

Flanges provide the ability to make a removable connection between two points.

Sightglass flanges bolt directly behind an outlet adaptor and provide the ability to view product in piping to ensure if a compartment/tanker has product present or if it has been drained.

Liquip can supply BF4 sightglasses as single units or in "Kits". A Kit is a part that combined two or more parts e.g. a BF4-SG-25Z is a  sightglass supplied with a mating 4" TTMA gasket. Please see ordering information tab for further detail.

Features & Benefits
  • Cast Acrylic design that provides superior optical clarity.
  • Annealed for improved performance with aggressive fuel additives.
  • Sightglass fits between two flanges of the same specification.
  • TTMA or ANSI flange options available.
  • Full face Viton gaskets available and recommended.
  • Sightglasses are date stamped to assist with planned maintenance.
  • Suitable for all common fuel grades including diesel, unleaded, jet and ethanol blends.
Technical Information

Operating Temperature
-50oC to 80oC.

Max Pressure

The standard drilling for sightglasses is TTMA, so the unit will fit behind an API adaptor as well as Liquip butterfly valve. 

Mounting bolts of adequate length tightened to a torque of 20Nm -
Tighten up evenly in a criss-cross manner.

Install with full face gaskets on both sides.

General Technical Information

Do not use with solvents – see compatibility on datasheet.
Do not flame polish.


Ordering Information

: Aluminium 100mm Tube to 4" TTMA Flange.

BF4-7: Aluminium 4" TTMA Blank Flange.

BF4-1: Mild Steel 100mm Tube to 4" TTMA Flange.

BF4-6: Mild Steel 4" TTMA Blank Flange.

BF4-1S-316: Stainless Steel 316, tube to 4: TTMA Flange.

API-SG-150: 4" ANSI Sightglass flange (ASA150 - 40mm thick).

BF4-SG-25: 4" TTMA Sightglass flange (25mm thick).

BF4-SG-25Z: BF4-SG-25 c/w 4" Neo Cork TTMA gasket.

BF4-SG-25VZ: BF4-SG-25 c/w 4" Viton A TTMA gasket.

BF4-SG-40: 4" TTMA Sightglass flange (40mm thick).

BF4-SG-40Z: BF4-SG-40 c/w 4" Neo Cork TTMA gasket.

BF4-SG-40VZ: BF4-SG-40 c/w 4" Viton A TTMA gasket.

Associated Equipment

API496: Complete with sight glass & drain.

API496B: Complete with blank plate & drain.

API496D: Handle moves down, complete with sight glass & drain.

DM104: Discharge Manifold with open/closed indicator.

LBV450VG: 4” Butterfly valve c/w bonded Viton GFLT seal.

LBV450VGZ: LBV450VG c/w 2 x 4” TTMA Viton gaskets.

LBV450VGL: 4” Buttefly valve c/w bonded Viton GFLT seal and aluminium locking tab.

LBV4-LA: 4” machined butterfly valve.