Description
Product
The Cylinder Black. Gasket – Sierra Marine Engine Parts – 18-2740 (118-2740) is a hard-wearing seal that is made durable and with high-quality materials to withstand the harsh marine environment. It is built to be non-corrosive to avoid rust on the seal. The Cylinder Black. Gasket – Sierra Marine Engine Parts – 18-2740 (118-2740) for Mercury/Mariner Outboard Motor fits Mercury/Mariner 27-43005-7 and is designed for Mercury 75 Hp 3 cylinder, 90 Hp 3 cylinder, 65 Jet. It is interchangeable with GLM 37660, Mercury Marine 27-430057, 27-430056, 27-430055, 27-430053, 27-430051, and 27-430052. Key Features:
- It is a hard-wearing seal that is made durable and with high-quality materials to withstand the harsh marine environment.
- It is built to be non-corrosive to avoid rust on the seal.
- Made for Mercury/Mariner Outboard Motor fits Mercury/Mariner 27-43005-7.
- It is designed for Mercury 75 Hp 3 cylinder, 90 Hp 3 cylinder, and 65 Jet.
- It is interchangeable with GLM 37660, Mercury Marine 27-430057, 27-430056, 27-430055, 27-430053, 27-430051, and 27-430052.
Specifications:
- Brand: Sea Star Solutions
- SKU: 18-2740
- UPC: 808282145774
- Weight: 0.39 LBS
- Alternate Products SKU: “27-27529”, “430057”, “REC27-430057”, “18-2740”
- Manufacturer Part Number (MPN): 118-2740
For: Mercury 65 Jet, 75 Hp 3 cyl., 90 Hp 3 cyl.
This product replaces:
- 47-2740, GLM37660, 808282145774, 27-43005, 7, 27-43005-7, 92-37660



![Dometic 25 Insulated Flex R4.2 Ducting/Duct – 4″ [9108549910]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/dometic-25-insulated-flex-r4-2-ducting-duct-4-9108549910.webp)


![Blue Sea 1221 12V DC Main + 19 Positions w/Digital Meter[1221]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-1221-12v-dc-main-19-positions-w-digital-meter-1221.webp)
![Xantrex Conext Combox Communication Box f/Freedom SW Series Inverters/Chargers[809-0918]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/xantrex-conext-combox-communication-box-f-freedom-sw-series-inverters-chargers-8.webp)
![Shadow-Caster Accent Lighting Flex Strip 8′ Terminated w/20′ of Lead Wire[SCM-AL-LED-8]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/shadow-caster-accent-lighting-flex-strip-8-terminated-w-20-lead-wire-scm-al-led-.webp)
![Ocean Signal RescueME EDF1 Electronic Distress Flare – 7 Mile Range[750S-01710]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/ocean-signal-rescueme-edf1-electronic-distress-flare-7-mile-range-750s-01710.webp)