MerCruiser Exhaust Manifold Engine Block Water Drain Petcock Valve 22-16951A1 Complete Upper & Lower Gearcases They made quite a few

They made quite a few different style of top caps

but general rule was V6 outboards

Exhaust extension Plate: 64162

PJ-75 PJ-075

Mercury 400E

MerCruiser Exhaust Manifold Engine Block Water Drain Petcock Valve 22-16951A1 Complete Upper & Lower Gearcases They made quite a fewItem Details Works on compatible with most MerCruiser Exhaust System 1 4" NPT Brass. All sorts of stuff, yours should look just like this. I. E. 120hp,140hp,165hp, 170hp 175,190,225,235 & 245 260 305 350 2. 5L 3. 0L 3. 8L V6 4. 3L 5. 0L 5. 7L V8 400 800 etc. Please check your parts manual to confirm, or just send me a message. This style is from the mid 80s or late 70's Parts Included 22 16951A1 22 87238 22 16951T1 (Set of 2 as pictured) Replaces: OMC