The Scubapro MK-2 is a flow-by, unbalanced piston first stage created and sold by Scubapro, Inc. starting in 1963. It contains one high pressure port and three low pressure ports. Its maximum flow rate is 92cfm. After continuous production and product updates, the MK-2 is still in production today as the MK-2 plus EVO.
MK-2 DIN and MK-3
MK-3 and MK 2
MK-200
MK-2 EVO, the most current production
Tools for servicing:
A.) ScubaPro Just-A-Wrench. (
Scubapro Just-A-Wrench, Aluminum)
B.) PeterBuilt Spanner #4 (
Hook Spanner #4 (1.4 in. diameter), $13.50)
C.) Yoke nut socket (
1" Yoke Nut Socket, #20)
D.) Standard piston first stage seat removal tool. Scubapro Part Number 10.102.100. (Peter Built)
MK2 Service/Rebuild
Repair Kit:
Item
ScubaPro P/N
10.042.045
McMaster P/N
Description
1. 01050138, O-Ring AS568A-2-011, Shore A 90, McMaster #5308T12 , Buna-Nitrile (High Pressure Port)
2. 01050132, O-Ring AS568A-2-010, Shore A 70, McMaster #9555K11 , Buna-Nitrile (Low Pressure Ports)
3. 01050177, O-Ring AS568A-2-022, Shore A 70, McMaster #9555K46, Buna-Nitrile (Large Piston Base Ring)
4. 01050126, O-Ring AS568A-2-008, Shore A 90, McMaster #5308T117, Buna-Nitrile (Small Piston Neck Ring)
5. 10102103, HP Seat, -----, Still don't have a good supplier of these. I tend to buy new old stock where possible. Dimensions are 0.185"OD, 0.138"thk +/-.003"
*Christo-Lube MCG-129 lubricant for o-rings.
*Optional: Conical Filter: I believe trident sells these...anyone have a P/N??
*Optional: External tooth washer.
NOTE: Some of the above are copied form other Scubaboard threads. Proper attribution will be added as I progress to the links section at the end. Work still in progress.
Resource Links:
Repair Kits: VDH
Store | Vintage Double Hose
HP Seat Removal Tool: Scuba Tools
HP Seat Removal Tool
Scubapro Multi-Tool: Scuba Tools
Scubapro Multi-Tool, Brass Chrome