Protec Head O-ring Conundrum

[Dustin Mustangs]

The -043's showed up today and they fit perfect. I don't know how or why but they do.

:AR15firingrotec and their boulsheet tech support:rocketwhore:

 

[Matt_E]

I hope that solves it for you.

 

[Freakrider]

From Pro tec site: Two cyl. head o-ring set - small (.072”) 14-9485... Two cyl. head o-ring set - large (.104”) 14-9487

 

[Dustin Mustangs]

Oh yeah, they'll sell you the 'right' ones and tried to everytime I called just looking for the size. They are $7 a pair with a $35 order minimum and will likely take weeks to show up. I got 10 of them from mcmaster for $9 and they were on my doorstep in 2 days. Put that in your pipe and smoke it Protec! lol

 

[subdude]

I'm going to install a head I bought a couple of years ago.Do you have the stock number from mcmaster?I ran into the same hassle w/pro-tec as you did.Thanks.

 

[Dustin Mustangs]

It turns out there are at least two different versions of this head, both using different orings. The one I've got uses the smaller -043 orings (mcmaster pn 5267T57). The other version of it uses the larger -153 orings (mcmaster pn 9464K114). There are some good pics in this thread to help you tell which one you have:

http://www.x-h2o.com/threads/40381

 

[Philip Clemmons]

We have used 153's in our head with good success...............as for which model head.......old! Bought back in 93-95 or so.

 

[Mouthfulloflake]

just keep both on hand -043, and -153, they are cheap enough, and make good spares for your future, or for your friends at a ride!

 

[Patrick Star]

I bought the viton -043 O rings from mcmaster carr for the newer style protec head and they seem very narrow for the groove.

 

[Mark44]

Just measure the groove and O-ring diameter with a calipers and pick the correct ring from McMaster Carr you have the head off...........

Mark44