All fittings employed on the high-pressure side of the compressor are rated to the elevated operating pressures of 15kpsi. Instead of simple swage connections we employ coned-and-threaded connections which can be used to much higher pressures. Specifically, we are using the medium pressure version which generally are rated to at least 15kpsi (although in practice most are rated to 21kpsi). Again, all parts were oxygen cleaned by the manufacturer! This needs to be specified when requesting the quote. Mounting instructions for these parts can be found on the following page: https://high-pressure-products.maxprotech.com/viewitems/technical-information/on-assembly-of-standard-coned-threaded-connections the Swagelok website has similar coned-and-threaded parts with associated manual. However, Swagelok do not recommend mixing the parts. It is important not to exceed the torque values given in the following table:

Description	Supplier	Part Number	Price	Lead Time
Nipple, ¼” size (which is the 4M size of Maxpro)	Maxpro	21N4M-length in inches-316	$10 - $100	1-2 weeks
Elbow	Maxpro	21L4M	$36.00	1-2 weeks
Gland	Maxpro	21G4M	$5.40	1-2 weeks
Collar	Maxpro	21C4M	$3.60	1-2 weeks
Tee	Maxpro	21T4M	$51.00	1-2 weeks
Cross	Maxpro	21X4M	$62.00	1-2 weeks
Needle valve	Maxpro	21V4M081	$132.00	1-2 weeks
Ball valve	Maxpro	21B244M	$391.00	1-2 weeks
Check valve	Maxpro	21BC4M	$128.00	1-2 weeks
Safety head	Maxpro	21SH4M	$113.00	1-2 weeks
Rupture disk, rated for 15 kpsi or 16960 kpsi	Maxpro	RD-15000 and RD-16960	$60.00	1-2 weeks
21,000 PSIG ¼ MP PLUGS	Maxpro	21P4M	$7.20	1-2 weeks
Stainless Steel Pressure Gauge, 0 to 20000 psi, 4HF	Maxpro	20PG44H	$361.00	1-2 weeks
Medium pressure Male -> High pressure Male adaptor, 1/4 in	Maxpro	21M4M4H	$68.00	1-2 weeks
Medium pressure female -> female NPT adaptor, 1/4 in	Maxpro	15F4M4P	$23.00	1-2 weeks
21,000 PSIG ADAPTER, ¼ HP MALE X ¼ MP FEMALE	Maxpro	21A4H4M	$44.10	1-2 weeks