There are two sizes of gaskets required for the 3+1/4inch Pre-WW1 Davison sight glass. A 31mm OD gasket to fit in the top cap and a 29mm OD gasket to fit on the base of the glass. One Top gasket and one Base gasket should be installed. In the kit there are 2x 2mm and 3mm thick gaskets (4 gaskets in total)

80mm diameter “Lucas Cadet” type Convex Carbide lamp lens.
With Polished Edges.

Available in black or red - price per foot

Part Nr 62-462 Enots dome oil sight glass base Gasket This gasket sits under the base of an Enots dome oil sight glass. There is a 2mm thick neoprene impregnated cork gasket and a 3mm thick gasket in the kit to cope with various thread lengths on the pumps over the decades . In unusual cases where a 4mm thick gasket is required consider purchasing two kits and place a 2mm gasket on top of another 2 mm gasket to achieve 4mm . Please read the secondary information below regarding estimating the thickness required.

BSA Fuel/Oil/cap gaskets 51.15mm OD X 40.90mm ID 1mm thick.
There are two individual gaskets for 2 caps plus a third gasket with which to practice the installation.
In addition there are two small tubes of a suitable adhesive.
Ensure you request us to email you a copy of the recommended installation procedure

1+3/8-inch X 1+5/8- inch Crushable Copper gaskets with asbestos substitute material inside. The typical Imperial size for your Douglas motorcycle valve port gaskets

Petrol/Oil cap gaskets, 2mm thick (for all- metal fuel/oil caps)
Suitable for many types of FLAT TANK motorcycles.
O/D 1-7/8"
I/D 1-1/2"

Sunbeam Fuel/Oil Cap gasket 2mm thick
Suitable for Sunbeam flat- tank motorcycles with caps which have an internal anti-splash pyramid.(as per the photo)
Just offer it to the threads and go round and round pressing with thumbnail and it “clicks” into place.

Part Nr 66-462 Triumph oil sight glass and gasket kit The engine mounted sight glass and gaskets for the late 1920s early 1930s Triumph. Models TT, ST, W, WS, N & NSD. This sight glass is best suited to the type of sight glass holder with the Screw-in type of retaining ring for the glass and gaskets and not the Push-fit type of retaining ring