Many diaphragm and small vacuum pumps come with G BSPP intake and exhaust thread ports. These 1/8 Inch G to KF-16 fitting adapters convert "G" BSPP thread to a KF-16 flange which is more commonly used in the universal world wide vacuum market. This thread size is primarily used in Europe and Great Britain.

BSPP = British Standard Pipe Parallel (straight thread) and is often noted G, for example, G(1/8).

Adapter KF-10 Flange to 1/8 inch Male BSPP Thread (British Standard Pipe Parallel), Stainless Steel
Common Dimensions:
A = 1.18 inch (30 mm)
B = 0.376 inch (9.6 mm)
C = 0.196 inch (5 mm)
D = 1.0 inch (25.40 mm)

These KF16 adapters screw into pump inlet and or exhaust for easy connection to standard ISO KF or NW roughing line fittings.