# 22863786A1 Mercury MerCruiser T Fitting Exhaust Drain Valve | Genuine Quicksilver OEM Part 🔧 Product Description Genuine Quicksilver T Fitting Exhaust Drain Valve - Part Number: 22-863786A1 Genuine Quicksilver/Mercury MerCruiser exhaust manifold drain T fitting assembly used in the raw-water drain system on selected MerCruiser MPI V6 and V8 petrol engines. This fitting is fitted into the exhaust manifold / elbow drain circuit and provides a serviceable drain point for removing cooling water from the exhaust system during flushing, winterisation, storage or routine maintenance. ⚙️ Key Features • Genuine Quicksilver/Mercury OEM fitting assembly • Exhaust manifold drain T fitting with drain valve function • Designed for selected MerCruiser MPI V6 and V8 petrol engines • Commonly used on 4.3L, 5.0L, 5.7L / 350 MAG and 6.2L MPI exhaust drain systems • Helps drain raw water from the exhaust manifold circuit for maintenance and freeze protection • Direct replacement for the original MerCruiser exhaust drain fitting where 22-863786A1 is specified 🔄 Supersession & Cross Reference OEM Supersession Chain: • No available supersession chain OEM / Related Numbers: • 22-863786A1 • 863786A1 • 22863786A1 • 22-05158 related drain T fitting reference • 25-864701 related O-ring used in matching exhaust manifold drain assemblies Aftermarket / Verified Equivalents: • REC: REC22-863786A1 • EMP: 22-05158 🚤 Compatibility Commonly used on: • Mercury MerCruiser MPI V6 and V8 petrol exhaust manifold drain systems • MerCruiser standard cooling and selected closed-cooling exhaust manifold drain assemblies • MerCruiser dry-joint exhaust manifold drain systems where 22-863786A1 is specified Typically suits: • Engine models: • MerCruiser 4.3L MPI Alpha / Bravo, serial range 0M300000 - 0M614999 • MerCruiser 4.3L MPI Alpha / Bravo, serial range 0W310000 - 0W649999 • MerCruiser 4.3L MPI Alpha / Bravo, serial range 0W650000 - 0W658582 • MerCruiser 4.3L MPI Alpha / Bravo, serial 0W658583 • MerCruiser 4.3L MPI Alpha / Bravo, serial range 0W658584 - 1A030367 • MerCruiser 4.3L MPI Alpha / Bravo, serial range 1A030368 - 1A030369 • MerCruiser 4.3L MPI Alpha / Bravo, serial range 1A030370 - 1A063239 • MerCruiser 4.3L MPI Alpha / Bravo, serial range 1A063240 and up • MerCruiser 4.3L MPI Alpha / Bravo EC, serial range 1A637496 and up • MerCruiser 5.0L MPI Alpha / Bravo, serial range 0M300000 - 0M599999 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 0M600000 - 0W059999 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 0W060000 - 0W309999 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 0W310000 - 0W649999 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 0W650000 - 1A299999 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 1A300000 - 1A611927 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 1A611928 - 1A623184 • MerCruiser 5.0L MPI Alpha / Bravo, serial range 1A623185 and up • MerCruiser 5.0L MPI Alpha / Bravo EC, serial range 1A300000 - 1A611927 • MerCruiser 5.0L MPI Alpha / Bravo EC, serial range 1A611928 - 1A623184 • MerCruiser 5.0L MPI Alpha / Bravo EC, serial range 1A623185 and up • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 0M300000 - 0M599999 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 0M600000 - 0W059999 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 0W060000 - 0W309999 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 0W310000 - 0W649999 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 0W650000 - 1A299999 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 1A300000 - 1A611927 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 1A611928 - 1A623184 • MerCruiser 350 MAG MPI Alpha / Bravo, serial range 1A623185 and up • MerCruiser 350 MAG MPI Alpha / Bravo EC, serial range 1A300000 - 1A611927 • MerCruiser 350 MAG MPI Alpha / Bravo EC, serial range 1A611928 - 1A623184 • MerCruiser 350 MAG MPI Alpha / Bravo EC, serial range 1A623185 and up • MerCruiser 350 MAG MPI Horizon Alpha / Bravo, serial range 0M300000 - 0M599999 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo, serial range 0M600000 - 0W059999 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo, serial range 0W060000 - 0W309999 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo, serial range 0W310000 - 0W649999 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo, serial range 0W650000 - 1A299999 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo EC, serial range 1A300000 - 1A611927 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo EC, serial range 1A611928 - 1A623184 • MerCruiser 350 MAG MPI Horizon Alpha / Bravo EC, serial range 1A623185 and up • MerCruiser 350 MAG MPI MIE, serial range 0M310000 - 0M316999 • MerCruiser 350 MAG MPI MIE, serial range 0M317000 - 0M398371 • MerCruiser 350 MAG MPI MIE, serial range 0M398372 - 0W389999 • MerCruiser 350 MAG MPI MIE, serial range 0W390000 - 0W689999 • MerCruiser 350 MAG MPI MIE, serial range 0W690000 - 1A089999 • MerCruiser 350 MAG MPI Horizon MIE, serial range 0M310000 - 0M316999 • MerCruiser 350 MAG MPI Horizon MIE, serial range 0M317000 - 0M398371 • MerCruiser 350 MAG MPI Horizon MIE, serial range 0M398372 - 0W389999 • MerCruiser 350 MAG MPI Horizon MIE, serial range 0W390000 - 0W689999 • MerCruiser 350 MAG MPI Horizon MIE, serial range 0W690000 - 1A089999 • MerCruiser 350 MAG MPI Ski, serial range 0M300000 - 0M316999 • MerCruiser 350 MAG MPI Ski, serial range 0M317000 - 0W689999 • MerCruiser 5.7L MPI MIE, serial range 1A090000 - 1A092168 • MerCruiser 5.7L MPI MIE, serial range 1A092169 and up • MerCruiser 5.7L MPI Horizon MIE, serial range 1A090000 - 1A092168 • MerCruiser 5.7L MPI Horizon MIE, serial range 1A092169 and up • MerCruiser 5.7L MPI TowSport with Gen III, serial range 1G400000 - 1G499999 • MerCruiser 6.2L MPI Ski, serial range 0M317000 - 0W689999 • MerCruiser MX 6.2L MPI Bravo, serial range 0M300000 - 0M599999 • MerCruiser MX 6.2L MPI Bravo, serial range 0M600000 - 0W059999 • MerCruiser MX 6.2L MPI Bravo, serial range 0W060000 - 0W309999 • MerCruiser MX 6.2L MPI Bravo, serial range 0W310000 - 0W649999 • MerCruiser MX 6.2L MPI Bravo, serial range 0W650000 - 1A299999 • MerCruiser MX 6.2L MPI Horizon Bravo, serial range 0M300000 - 0M599999 • MerCruiser MX 6.2L MPI Horizon Bravo, serial range 0M600000 - 0W059999 • MerCruiser MX 6.2L MPI Horizon Bravo, serial range 0W060000 - 0W309999 • MerCruiser MX 6.2L MPI Horizon Bravo, serial range 0W310000 - 0W649999 • MerCruiser MX 6.2L MPI Horizon Bravo, serial range 0W650000 - 1A299999 • MerCruiser MX 6.2L MPI MIE, serial range 0W690000 - 1A089999 • MerCruiser MX 6.2L MPI Horizon MIE where fitted with the matching exhaust manifold drain assembly • MerCruiser Black Scorpion 350 MAG MPI where fitted with the matching exhaust manifold drain assembly • MerCruiser Black Scorpion MX 6.2L MPI where fitted with the matching exhaust manifold drain assembly • MerCruiser Scorpion 350 EC where fitted with the matching exhaust manifold drain assembly • MerCruiser Scorpion 377 HO EC where fitted with the matching exhaust manifold drain assembly • MerCruiser 350 MPI Alpha reman, serial range 1G400000 - 1G499999 • MerCruiser 383 MAG Stroker reman, serial range 1G400000 - 1G499999 • MerCruiser 383 MAG Stroker Bravo reman, serial range 1G400000 - 1G499999 • HP Range: Approximately 190HP - 377HP, depending on engine package • Engine Type: MerCruiser petrol MPI V6 / V8 stern drive, inboard and tow-sport exhaust manifold drain system • Year Range: Approximately 2001 onwards, depending on engine model, serial number and cooling configuration 🔌 Function The exhaust drain T fitting provides a drain point in the MerCruiser exhaust manifold water circuit. It allows cooling water to be drained from the manifold and elbow area during service, storage, flushing or freeze-protection procedures. A correctly functioning drain fitting helps prevent trapped water, corrosion, cracking from freezing and poor drainage during maintenance. Common signs of failure: • Water leaking from the exhaust manifold drain fitting • Cracked, brittle or heat-damaged fitting body • Drain valve blocked with salt, sand or corrosion • Exhaust manifold not draining correctly during service • Difficulty winterising or flushing the exhaust water circuit • Visible damage or missing drain fitting components 📦 Condition • Genuine Quicksilver part • Brand new • Supplied in original or equivalent packaging ## Details - **Price:** 79.0 AUD - **Vendor:** Quicksilver - **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 79.00 AUD | In stock | ## Images - 22863786A1 Mercury MerCruiser T Fitting Exhaust Drain Valve | Genuine Quicksilver OEM Part --- > Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/22863786a1-mercury-mercruiser-t-fitting-exhaust-drain-valve-genuine-quicksilver-oem-part) > Updated: 2026-05-20