O-ring Material : NBR. NBR Properties : -20°C to 100°C Working Temperature Range. Suitable Applications : Oil & Grease Resistant, Suitable For Sealing Pipes, Connectors etc. (Not For Drinking Water).
eBay
M56-M48 Adapter Ring Female M56*0.75mm Thread to Male M48*0.75 Thread forAstronomical Telescope Photography Accessories
Aliexpress UK
NBR is a popular choice for Agricultural, Dairy, Plumbing, Mining, Rail and Transport Applications. NBR is attacked by Esters, Ozone, Retones, Aldehydes, Chlorinated and Nitro Carbons. Nitrile is one of the commonly used materials for O-Rings.
eBay
Lightdow 650-1300mm Super Telephoto Manual Zoom Lens F8.0-F16 With T2 Adapter Ring for Canon Nikon Sony Pentax DSLR Cameras
Aliexpress UK
Imperial FKM Black Rubber O-Rings 1.78 Cross Section BS001 - BS031 ID. All of these designations actually stand for one single base material:fluoro rubber. FKM has a low compression set and have high temperature and chemical resistance.
eBay
StarDikor M48 To M42 Telescope Adapter Ring Aluminium Alloy Female Thread T(M48mm*0.75mm) To Male Thread T2(M42*0.75mm)
Aliexpress UK
O-ring Material : NBR. NBR Properties : -20°C to 100°C Working Temperature Range. Suitable Applications : Oil & Grease Resistant, Suitable For Sealing Pipes, Connectors etc. (Not For Drinking Water).
eBay
M48 To M42 Telescope Adapter Ring Female Thread T(M48mm*0.75mm) To Male Thread T2(M42*0.75mm) Photography Accessories
Aliexpress UK
O-ring Material : NBR. NBR Properties : -20°C to 100°C Working Temperature Range. Suitable Applications : Oil & Grease Resistant, Suitable For Sealing Pipes, Connectors etc. (Not For Drinking Water).
eBay
M42 (T2) - C/CS for M42 x 0.75 (T2) mount - C / CS Mount Adapter Ring M42-C M42-CS for Macro photography for Telescope
Aliexpress UK
O-ring Material : NBR. NBR Properties : -20°C to 100°C Working Temperature Range. Suitable Applications : Oil & Grease Resistant, Suitable For Sealing Pipes, Connectors etc. (Not For Drinking Water).
eBay
2Pcs 1.0/1.2mm 304Stainless Steel O-ring Hook Spiral Extension Spring, OD: 6/8/10/12mm, Length: 20-120mm Support Customization
Aliexpress UK
O-ring Material : NBR. NBR Properties : -20°C to 100°C Working Temperature Range. Suitable Applications : Oil & Grease Resistant, Suitable For Sealing Pipes, Connectors etc. (Not For Drinking Water).
eBay
Lightdow Super Telephoto Mirror Lens 900mm F8.0 Camera Lens With T2 Mount Adapter Ring for Canon Nikon Pentax Sony Cameras DSLR
Aliexpress UK
O-ring Material : NBR. NBR Properties : -20°C to 100°C Working Temperature Range. Suitable Applications : Oil & Grease Resistant, Suitable For Sealing Pipes, Connectors etc. (Not For Drinking Water).
eBay
900mm f/8.0 Super Mirror Telephoto Manual Focus Lens + T2 Mount Adapter Ring For Canon Nikon Pentax Sony Olympus DSLR Camera
Aliexpress UK